Frost is busy with two cases: smugglers trafficking in rare and endangered species and murder and the naked body of an art teacher discovered in the bedroom of returning vacationers.

Frost is summoned to a remote farm-house by criminal Kevin Flanagan who is in a blind panic. At the farm he finds a crocodile and cages full of endangered species as well as a severed leg. This transpires to belong to an oriental man, part of the gang who have been smuggling rare animals, and Flanagan, who has escaped the gang, is used by Frost to help locate its leader. At the same time the Harris family are shocked to find the nude corpse of a local art teacher in their bedroom. A search of his studio yields revealing photos of a female colleague but it is the Harrises' teenage son, who, literally holds the key to events.

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