Dina Hunter (Barbara Eden), wealthy and unstable, takes a Mexican holiday with her husband Jerry (Robert Vaughn) in order for her to recover from a traffic accident. An artist named Paul Carter (Stuart Whitman) becomes intrigued by Dina and wants to paint her portrait. Dina's interest in him leads her to uncover clues that he is more than just an artist — she discovers that he may possibly be a jewel thief and murderer. She tries to convince her husband and the local authorities but no one will believe her story.