Stuart Margolin guest-stars "Hot" Rod Crysler, an old Naval Academy buddy of Thomas Magnum (Tom Selleck). A hard-luck case if there ever was one, Crysler has only recently been released from prison, and is scratching out an existence as a door-to-door encyclopedia salesman. Unfortunately, corrupt narcotics officer Emmet Donner (Roland Hunter) is blackmailing Crysler into using his bookselling job as a front for drug-smuggling. To keep his old pal from being sent back to prison for keeps, Magnum joins forces with "Hot" Rod's sympathetic parole offiecr (Carlene Watkins). ~ Hal Erickson, Rovi