Marco, an impoverished engineering student, hides his wealthy friend Andre at his apartment in a fake kidnaping plot to obtain money from Andre's father, a furniture manufacturer. While the youths await the outcome of their ransom demand, Marco's girl friend, Micki, and her studious friend Gigi visit the apartment. Unaware of his identity, Micki falls in love with Andre, and in a jealous rage, Marco strangles his friend in the bathtub. At a party with a number of thrill-seeking friends, Marco reveals to Micki that he has killed Andre, and she agrees to help him keep the crime a secret. Meanwhile, a lawyer working for Andre's father tracks down Gigi, who in turn leads him to Marco and Micki.
