The film starts with Nikhil Oberoi (Arjun Rampal) and his wife Simer (Priyanka Chopra) having an accident. While Simer escapes with bruises, Nikhil's life is in danger. But he eventually recovers, but loses his memory. He has to depend on his wife to know his past. But soon, he realises something is not right. Apparently, he was about to divorce his wife just before the accident. It appears that she was having an extramarital affair with someone called Kabir (played by Sudhanshu Pandey).

The turbulent phase in their life draws Nikhil and Simar closer. Nikhil begins to reconstruct his life. At first, he relies on the care and guidance of his loving wife and business associates [Ankur Nayyar, Kim Sharma]. But confusion starts mounting with contrasting pictures of his past being painted by everyone around him, with strange flashes of memory coming to him from time to time. Nikhil starts experiencing some terrifying moments. His mental trauma increases when he starts suspecting Simar's fidelity.

Story-screenplay writer Vikram Bhatt and director Girish Dhamija disentangle the incidents with dexterity. The twists and turns in the plot keep the viewer engrossed all through the first hour.

Himesh Reshammiya seems to stress on soulful tunes, instead of sound and fury and it's evident in this score as well. 'Meri Aankhon Mein Hai Tu' and 'Bhoolna Nahin' are tunes you'd want to hum when you hear them again.

Cinematography [Anushuman Mahaley] is eye-pleasing, with the visuals of Manali giving the film a distinct flavor. The chase sequence in the post-interval portions [Abbas Ali Moghul] is expertly executed. Editing [Kuldeep Mehan] could've been tighter in the second half. Visual effects [Biju D.] are tacky. The makeup of Arjun during the hospital sequences [Arunadetya Seal M] is realistic.

Arjun Rampal delivers his best performance so far.

Priyanka Chopra is bound to win laurels yet again, after AITRAAZ.

Kim Sharma is effective in a brief role, although her exit cuts short her chances of proving her talent. Saurabh Shukla is excellent as the detective. Ankur Nayyar, as Kim's brother, is efficient. Anang Desai [Doctor] is alright. Sudhanshu Pandey is first-rate, handling his part with efficacy.

On the whole, watch Yakeen? Only if you have nothing else to while away your afternoon.