A descendant of the notorious Borgias begins to believe that he has inherited their murderous tendencies in this thriller. The trouble begins after he visits his ancestral castle in Italy. After he finds success as a playwright, he begins to suspect that he, too, is a killer. The delusional writer writes a play and casts a seductive actress as the lead. He begins to suspect that she is the incarnation of Lucrezia Borgia. Later, a murder happens; the prime suspects are the playwright, the actress, and the playwright's psychiatrist.