Raj Mathew (Sanjay Kapoor), has a problem in his life. By profession a film star, he loves his wife, but she is acutely suspicious of him. His marriage is on the rocks.
Mahulika (Aditi Gowatrikar), Raj's wife has a problem. She loves Raj but cannot control the insecurity of losing him to another woman. Her love is self destructive.
Preity Saradesai (Raveena Tandon), a choreographer turned director has a problem of being labeled the other woman, whereas it is not so. Though she is in love with Raj, she keeps her distance and knows that what cannot be must not be.
When Om (Arbaaz Khan), enters the lives of these people, he comes not only with his problem, but also with a solution - MURDER, and a murder is committed.
SOCH then becomes a thriller which will not keep you at the edge of your seats, instead it will push you further into it and make you think, Why? Why does a man have to kill? Is it hate or is it an extreme form of love or the extreme desire to be loved that makes him or her, a murderer. The answer lies in SOCH.