 Jerry (Paul Burke), a Southern California golf pro is the target for Diana (Carol Lynley) a disturbed young woman who desires the death of her shrink, who alone realizes her psychotic potential and seeks to have her committed. She suggests to Jerry that they "swap" murders - she ll kill his golf rival and he ll reciprocate by killing her psychiatrist. When she holds up her half of the bargain, she expects him to follow through with his end. Remake of Hitchcock s classic "Strangers on a Train."