Cynical, smarmy PR man Stu Shepard picks up a ringing phone in a booth in a busy New York street to find a killer on the line. Armed with a high-powered sniper's rifle, the anonymous caller soon proves his prowess and presents Shepard with a choice - convince the police of his story before they shoot him or drop the phone and be shot. His only hope lies in self abasement and facing up to the truths of his life.