Ittefaq means coincidence. Sometimes life appears to be a string of coincidence unrelated to any logic. This is a coincidence of a man charged for murder fleeing from the law and getting involved in another murder - a murder he didn't commit. A lonely night... a comfortable house... a beautiful girl alone... Rekha (Nanda) switches on the radio and hears that a lunatic murderer has escaped from the mental asylum. The door bursts open and Dilip Roy (Rajesh Khanna) enters. That is when a chance encounter turns a quiet night into a nightmare - Rekha is reduced to a prisoner in her own house. Roy had no alternative but to take refuge in the first house that came his way, since he is on the run from the police. But those few hours in that house become a small world where a larger-than-life drama takes place from midnight to dawn. Ittefaq is a story of just one night, one man, one woman and one big Coincidence.