is a 2014 Indian Hindi-language action thriller film directed by Siddharth Anand and produced by Fox Star Studios.

[3] An official remake of the 2010 American film Knight and Day, it marks Anand's running foray into the action genre, and stars Hrithik Roshan and Katrina Kaif, alongside Javed Jaffrey, Danny Denzongpa, Kanwaljit Singh, Deepti Naval, Vikram Gokhale and Pavan Malhotra.

In the film, a mysterious thief encounters an unassuming bank receptionist, which sets off a chain of events resulting in a series of escapades.

Omar gets escorted by his trusted lieutenant Hamid Gul and declares US$5 million reward for an Indian thief to steal the Koh-i-Noor.

Rajveer Nanda, a mysterious person, steals the Koh-i-Noor and demands US$20 million when Zafar and Gul aim to retrieve it.

Harleen leaves upon learning the truth and seeing the real Vickie who admits to his car and phone failing him, but on her way back home, she bumps into Rajveer again, and he seeks her help to remove a bullet.

Before leaving, Rajveer drugs her with sedative water and informs her of scare tactics that some law enforcement officials will try and coerce her into working against him.

Rajveer's prediction comes true as two government agents Zorawar Kalra and his informer, Inspector Bhola implore Harleen to travel with them to the police station, but instead head for a safe place.

During a visit to a Pizza Hut outlet, Rajveer reveals that he stole the Koh-i-Noor, much to Harleen's surprise, and the pair are immediately confronted by Zorawar and his team.

Harleen wakes up the following morning in Prague, where she regains her faith in Rajveer after recognising his efforts in leading the escape.

Harleen is taken to the Indian Embassy, where she meets Zorawar and his boss, Internal Secret Services Chief Narayanan as he gives her a tracking device to pinpoint Rajveer's location and retrieve the Koh-i-Noor.

Harleen returns home and reunites with her grandmother, but begins to miss Rajveer; in a moment of epiphany, Harleen locates his house and meets Rajveer's father Pankaj and his mother Shikha by posing as a delivery runner for Pankaj's book order.

A tense moment results in Harleen trying to leave suddenly when she soon bumps into photographs of Rajveer, who is revealed by Shikha to be Jaiwant "Jai" Nanda, Viren's brother; while Viren's murder is confirmed, Pankaj refuses to accept the army's version of the story behind Jai's death as he pinpoints to a swimming championship trophy he had won in his young days, being the only person who was able to cross the lake in just one breath.

Zorawar gives Harleen a truth serum in an attempt to find the location of the real diamond, but she deduces that Rajveer is alive and is arriving to kill Zafar and his men.

Rajveer loses consciousness and starts to drown, but is saved by Harleen as army officers airlift the duo.

Rajveer wakes up in a hospital and is informed by Narayanan, revealed to be his real boss, that he will not be allowed to see Harleen or his own family.

Earlier reports had suggested that Siddharth Anand, who had made Salaam Namaste, Ta Ra Rum Pum, Bachna Ae Haseeno and Anjaana Anjaani in the past, planned to make his next film with Shahid Kapoor, but Shahid Kapoor wanted to avoid comparisons with Tom Cruise and did not have availability of his dates for the film as he had signed onto Haider.

in protest of foreign make-up artist Daniel Bauer working on the movie for its lead actress, Katrina Kaif.

In an interview with Mumbai Mirror, Roshan spoke about the action sequences in the film stating, "I have pushed myself to the extreme for this stunt.

"[14][15][16] In July 2013, one of the songs of the film, "Meherbaan" was shot in the city of Santorini in Greece and choreographed by Ahmed Khan.

[43][44] While filming in Thailand, Roshan suffered a head injury from a stunt accident and underwent brain surgery at the Hinduja Hospital, done by B. K. Misra to relieve subacute-subdural hematoma.

[45][46] On the lines of the popular Ice Bucket Challenge – one of the biggest trends of the year, the dare on social media, Roshan came up with the dare-to-do game to Bollywood co-stars Aamir Khan, Shah Rukh Khan, Salman Khan, Nargis Fakhri, Sonam Kapoor, Ranveer Singh, Farhan Akhtar, Priyanka Chopra, Dino Morea, Uday Chopra and Dabboo Ratnani on Twitter asking them to post videos of themselves doing a particular task and adding the hashtag #bangbangdare to it.

[47][48][49][50][51][52] One of the companies challenged Roshan himself, where he was asked to buy bed sheets from their store and if he did, ₹500,000 would be donated to city hospitals.

[56] A promotional mobile video game based on the film was developed by Nazara Technologies and released the same year.

This desi adaptation of Knight and Day has charm in abundance because of its effervescent lead pair, but it lacks coherence.

"[71] Rajeev Masand on IBN Live gave 2/5 stars and commented that "the film isn't unwatchable, but certainly tests your patience.