In Rendezvous Key, a beautiful private island in Key West is the backdrop for a double murder. Two people are killed inside a sauna, and there are no witnesses to testify to what happened and who may be responsible. A very young, very handsome police lieutenant sets out to solve the mystery. Another twist presents itself, though, as he meets a very luscious blonde who he immediately falls head over heels in love with at first sight only to find out she is the murdered woman's best friend. She was also a lover of the murdered man. Now he has a dilemma for he can't really become involved with her for she may be a suspect. Does he become involved with her or not?