An explosives expert (Gene Hackman) escapes from prison and heads to Mexico to take revenge on the agent (Jim Backus) who arrested him.
Dr. Leonard "Bones" McCoy meets a former girlfriend when the Enterprise brings supplies to a remote archaeological survey group. Still attractive to McCoy, the woman's current appearance and her colleague hide a deadly secret, ultimately revealed as a tragedy of ecology.
Tod and Buz try to stop a murderer who has left his latest victim in the snow at Squaw Valley.
The voodoo curse of Papa Benjamin wreaks havoc on a composer (John Ireland) who uses a mystical melody in his latest performance.
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