Omi Khurana’s London dream has just ended. On the run from a dangerous UK gangster who he owes money to, Omi returns to his native village in Punjab, pretending to be a well-heeled London lawyer. Much has changed since Omi ran away from home a decade back after stealing money from his doting grandfather, Darji. The old man has since become senile and most importantly, forgotten the secret recipe of "Chicken Khurana" a dish that made the Khurana dhaba (restaurant) famous across Punjab. Omi’s childhood sweetheart, Harman is soon to be married to his cousin, Jeet, though neither seems too happy about it. Adding to the quirkiness of the Khurana family is a free loader uncle, Titu, who once did a stint at a mental asylum. Omi's grandfaher has a cousin sister who ran away from home at early age and is now a saint. His grand father dies on his last visit to his restaurant.

Shashi Godbole (Sridevi) is a housewife who makes and sells laddoos as a home-run business. Her husband Satish, (Adil Hussain) and daughter, Sapna (Navika Kotia) take her for granted, mock her poor English skills and generally treat her with disrespect, making Shashi feel negative and insecure. However, her young son, Sagar (Shivansh Kotia) loves her as she is, and her mother-in-law (Sulabha Deshpande) offers her words of sympathy.

Shashi's older sister Manu (Sujatha Kumar), who lives in New York, invites Shashi's family to her daughter Meera's (Neeju Sodhi) wedding to Kevin (Ross Nathan). It is decided that Shashi will go to New York alone to help Manu organize the wedding, and her husband and children will join her as the wedding approaches. During her flight to America, Shashi is given inspirational advice by a fellow passenger (Amitabh Bachchan). While Shashi is in New York, she has a traumatic experience at a coffee shop due to her inability to communicate in English. Using the money she made from selling laddoo's she secretly enrolls in a conversational English class that offers to teach the language in four weeks, showing her resourcefulness at navigating an unfamiliar city alone. The class comprises: David Fischer, the instructor (Cory Hibbs); Eva, a Mexican nanny (Ruth Aguilar); Salman Khan, a Pakistani cab driver (Sumeet Vyas); Yu Son, a Chinese hairstylist (Maria Romano); Ramamurthy, a Tamil software engineer (Rajeev Ravindranathan); Udumbke, a young African-Caribbean man (Damian Thompson); and Laurent, a French chef (Mehdi Nebbou). Shashi quickly becomes a promising and committed student, earns everyone's respect with her charming behavior and her cuisine, and gains self-confidence. Laurent becomes attracted to Shashi. When he tries to kiss her at the rooftop of a building, Shashi pushes him away and runs off, but fails to explain that she is married.

Meanwhile, Shashi's niece Radha (Priya Anand) who is Meera's younger sister finds out about her secret English classes and is supportive of her pursuit. Shashi starts watching English films at night and does her homework assiduously. To complete the English-speaking course and get a certificate, each student must write and deliver a 5-minute speech. Shashi's family joins her in New York earlier than expected. Shashi tries to continue attending class, but decides to quit because of schedule conflicts, and asks Radha to inform David Fischer. The test date coincides with that of the wedding, and Shashi is forced to miss the test.

Radha invites David and the entire class to the wedding, where Shashi's husband Satish is taken aback at being introduced to a diverse group of people by his wife. Shashi gives a touching and enlightening toast to the married couple in English, surprising everyone who knew her as a typical, conservative, Indian housewife. In her speech, Shashi extols the virtues being married and having a family, describing the family as a safe space of love and respect where weaknesses are not mocked. Shashi's husband and daughter regret treating her with disrespect. Her teacher David declares that she has passed the course with distinction and issues her the certificate. Shashi thanks Laurent for "making her feel better about herself". Shashi's family return to India; during their flight home, Shashi asks the flight attendant in fluent English whether she has any Hindi newspapers in Hindi version.

Meera (Diana Penty) is a shy and simple traditional girl who leaves her family in India to live in London with her new husband Kunal (Randeep Hooda). While at the London airport, she meets the shameless flirt Gautam "gutlu" (Saif Ali Khan), who hits on her and asks her out. Meera politely tells him that she is married and then leaves. Meera searches for her husband and finally finds him, but he is angry to see her and explains that he only married Meera for her money, telling her to stay away from him. This leaves Meera heartbroken and stranded in London with no place to stay.

While in the bathroom at a department store, Meera meets party girl Veronica (Deepika Padukone) who sees Meera weeping and decides to help her. Veronica takes Meera to her apartment and explains that her estranged father sends her a large amount through cheque every month, which helps Veronica enjoy the life of a rich socialite. One night, Veronica takes Meera to a nightclub, where they run into Gautam. At the club, Gautam and Veronica dance intimately and make out. The next morning, after an interview, Meera comes home to find Gautam on the couch. She learns that Gautam and Veronica slept together the previous night.

Soon, Gautam moves in with Veronica and Meera, continuing his "no strings attached" relationship with Veronica. Although Meera initially dislikes him, she eventually accepts him, and the three become best friends. Things get complicated when Gautam's mother (Dimple Kapadia) shows up, wanting to know if Gautam has found the girl he wants to marry. He lies to his mother and says that he is in a relationship with Meera because she is the "ideal Indian girl" who would meet his mother's approval. During this charade, Gautam and Meera end up falling in love. However, Meera is hesitant to admit it, because she does not want to hurt Veronica, who has fallen in love with Gautam and is trying to win the approval of his mother by becoming a proper Indian girl. Gautam sits the two girls down and explains to Veronica that even though she loves him, he is in love with Meera. Meera apologises to Veronica, but Veronica assures her that it is okay and insists that they all go to the club to celebrate.

However, at the club, a drunken Veronica breaks down, telling Gautam that she will do whatever he wants, and she tells Meera that no one has ever used her the way Meera did. The next morning, the three part ways. One night, Veronica is injured after being hit by a car. Gautam rushes her to hospital. Meera comes there with Kunal to make it look like she has gotten over Gautam.

Gautam moves back in with Veronica to care for her. Veronica realises that Gautam is no longer the flirtatious, fun-loving man with whom she fell in love and that he is that man only when he is with Meera. She sacrifices her love for Gautam realising she is not perfect for him, and she helps him locate Meera. They seek out Kunal, who tells them that Meera left him because she loved Gautam too much and that she has gone back to India. Gautam and Veronica travel to Delhi. Gautam proposes to Meera, and she accepts. Veronica and Meera became best friends again.

The movie begins with Bittu (Sonu Sood) planning with the local MLA Varadarajulu (Kota Srinivasa Rao) to rob 15 billion (US$240 million) from Vizag Co-operative Bank. Ravindra Narayan (Allu Arjun) is a brainy individual who believes in earning quick money rather than toiling like his father Narayana Moorti (Tanikella Bharani) for every month's salary. He gets into a dispute with his father about his attitude and challenges him that he would convert  10,000 into  100,000 in quick time. He happens to meet Bittu on his way, who drops him at his destination. Ravi inadvertently reveals his plan of making quick money by betting on an IPL match and also the location of betting to Bittu and his companions on the way. However his plans turn upside down when police raid the location and is caught red-handed. During interrogation, Ravi guesstimates that Bittu could have diverted the Police, and that he is about to commit a robbery at the Vizag Cooperative Bank. He convinces ACP Raja Manikyam (Rao Ramesh) that Bittu is planning to rob the bank and both go to catch him. Bittu successfully robs the bank and his brother Laala (Shafi) takes the money to the city's dumping yard, as per Bittu's instructions, as the Police follow them. However Police catch Lala, who resists them only to be killed by Ravi. Police try to trace the money but in vain. Meanwhile Bittu gets arrested, but is rescued in transit by his sidekick Devayani (Sheetal Menon). They go to the dumping yard to collect the money but Bittu is shocked as the dumping yard is burnt to ashes. Having his brother dead and the money burnt, Bittu decides to kill Ravi.

Raja Manikyam sends Ravi to Hyderabad from Visakhapatnam under Witness Protection Program and makes him to stay at his friend ACP Sitaram (Rajendra Prasad)'s house. ACP Sitaram is a cowardly cop who is afraid of using his gun. One day, Ravi happens to see Madhu (Ileana), a middle class girl who works with travel agent Travel Moorti (Brahmaji), an associate of Bittu. He prepares fake passports for Bittu's gang to help them escape from India. Ravi befriends Madhu and both fall in love with each other. Ravi steals Madhu's identity card which leads Sitaram and him to know all the details regarding the escape plan of Bittu, in which Madhuwould be tricked to pose as Bittu's wife, suffering from vertigo to help him escape easily. Ravi and Sitaram go after Bittu, with Sitaram of the impression that Bittu would go to airport. However, Bittu plays a trick on them and escapes through other route. Ravi, however, outwits Bittu and forces Sitaram to go in the route taken by Bittu. Ravi and Bittu confront each other and Bittu threatens to kill Madhu. However, Devayani forces Bittu to abandon Madhu as Bittu is surrounded and they escape.

Bittu vows to exact revenge on Ravi by targeting his family. He decides to kidnap Ravi's family, but before he could, Ravi shifts his family to Hyderabad. Frustrated, Bittu seeks the help of Varada Rajulu to help him escape to abroad. But Varadarajulu tells him that he is helpless in this matter. Enraged, Bittu kills him. But before dying Varadarajulu tells the truth that he and Raja Manikyam had the custody of the loot. Bittu makes a deal with Raja Manikyam and traps Ravi in a car blast with Manikyam faking his death. Ravi gets arrested but is released on bail by Sitaram. Ravi realises the foul play and also that Manikyam too is involved in the robbery. Meanwhile, Ravi's family is kidnapped by Travel Moorti. Ravi manages to save his family but not before Travel Moorti shot his father. Narayana Moorti is shifted to ICU where he prods Ravi to restore the 15 billion to the Bank.

Meanwhile, Ravi's sister is kidnapped by Devayani and Bittu shifts her to Visakhapatnam. Ravi gets to know the location of his sister through Travel Moorti and he leaves for Visakhapatnam with Sitaram. Ravi finds that the whole money is being transported in 1 of 3 containers by Bittu to the sea port. He finds out the right container and the driver of the container. He uses his sharp wit to divert the container and makes it stop before the very bank from which the money was stolen. Bittu is confronted by Ravi & Sitaram and a fight arises between Ravi and Bittu. Sitaram shoots Bittu while he tries to kill Ravi and by their last conversation, Ravi comes to know the location of his sister and Devayani and saves his Sister while Sitaram apprehends Devayani. The film ends with Sitaram transforming into a tough cop and Ravi having a change of mind and starting to believe in hard work.

Late at night on a deserted road, well-known actor Armaan Kapoor (Vivan Bhatena) loses control of his car for no evident reason, apparently trying to avoid something, and drives into the sea. Inspector Surjan Shekhawat (Aamir Khan) with his assistant Devrath Kulkarni (Rajkummar Rao) begins an investigation into Armaan's death. Surjan's personal life is in turmoil since his 8-year-old son, Karan, drowned recently during a family outing. His wife, Roshni (Rani Mukerji), is still grieving and Surjan has developed a guilt complex.

Surjan learns that on the night of Armaan's accident, Armaan was travelling with 2 million rupees in cash, which is missing from the car. Armaan had given the money to a blackmailer, a pimp named Shashi (Subrat Dutta). Three years back, Shashi had performed a cover-up for Armaan and his friend Sanjay Kejriwal (Suhas Ahuja). Once he learns of Armaan's death, Shashi takes off with the cash, leaving behind a mistress, Mallika (Aditi Vasudev). Shashi's friend, Tehmur (Nawazuddin Siddiqui), steals Shashi's discarded sim card. Shashi begins blackmailing Sanjay. In panic, Sanjay employs some thugs to murder Shashi. Tehmur begins to use Shashi's old sim card to blackmail Sanjay with Shashi's murder.

Meanwhile, Roshni seeks solace from a medium (Shernaz Patel) who is in touch with Karan's soul. One night, Surjan is propositioned by an escort, Rosie (Kareena Kapoor). He declines Rosie's advances but asks her if she can become an informer. Through Rosie, Surjan finds out about Shashi's connection with the case. The police find Shashi's body, along with the blackmail money and a DVD. The DVD contains embarrassing CCTV footage of Armaan and his friends leaving a hotel with a girl. Convinced of Armaan's link with prostitutes, Surjan focuses his search on the slums near the Hotel Lido. To speak unobserved, Rosie takes Surjan to a quiet place by the riverside and tells him that three years ago, she was picked up by Armaan and his friends, Sanjay and Nikhil (Prashant Prakash). However, she doesn't reveal anything more. Surjan tries to approach Nikhil for more information but discovers that Nikhil has been brain-dead after the incident three years ago. After a heated argument with Roshni, Surjan confides in Rosie, who comforts him by taking him to the Lido.

Tehmur is killed by the two thugs in Sanjay's employ. One of the thugs is captured by the police and reveals that Sanjay has been behind the murders of both Shashi and Tehmur. Surjan arrests Sanjay, who confesses that three years ago, Sanjay, Armaan and Nikhil had picked up an escort to celebrate Nikhil's birthday. While driving, Nikhil began making out with the girl in the backseat. The car door opened by accident, throwing both Nikhil and the girl from the moving car to the road. Both were badly injured. Armaan and Sanjay rushed Nikhil to the hospital but fearing scandal, left the girl unattended on the road. Sanjay had called Shashi to ask him to take care of her. However, Shashi informed them that the girl had died and that he had footage of the three leaving with her. Since then, Shashi had continued to extort money from them by blackmail.

Surjan re-watches the footage and realizes that the girl is Rosie. As he drives Sanjay to the police station, they approach the same road where Armaan had his car accident. Both Surjan and Sanjay see Rosie standing ahead. In a re-enactment of Armaan's accident, Sanjay swerves the car into the river. With Sanjay already dead, Surjan struggles to get himself out of the car. Rosie appears underwater and saves him. At the police station, Surjan's superior advises him against reporting his incredible story. Surjan agrees to write in the official report that Armaan Kapoor's death was an accident. He returns to the riverside place where he used to meet Rosie and uncovers her remains where Shashi had hidden her body. Remembering that he had been told that "the dead come to those who are troubled," he gives her a proper funeral.

Now more accepting of the supernatural, Surjan finds a letter from Karan, penned by the medium. Through the letter, Karan tells Surjan not to blame himself for his death and that he wants both his parents to be happy. Surjan cries and Roshni consoles him. The two are reconciled.