Stefano Argenti, an ambitious advertising executive, meets a curious hippie named Count Mateo Tiepolo and they form a strange bond. Having gained Stefano's confidence, Tiepolo reveals that he wants to kill his domineering brother. He suggests that Stefano carry out the killing and in exchange he offers to murder Luisa, Stefano's wife who is a barrier to his career and his affair with Fabienne, a model. Argenti is more curious than shocked but decides to reject the bizarre offer. However, a short-time later, his wife is strangled to death by an intruder and he becomes the prime suspect. By withholding evidence that could prove his innocence. Mateo blackmails Stefano into keeping his part of the bargain. But there is a twist ...