fter a break-in at Causton Museum where an animal skeleton is stolen ex-spy Brenda Packard tells Barnaby that Allenby House, owned by testy ex-spymaster Malcolm Frazer, is a safe house for agents. Geoffrey Larkin, a visiting former agent, has a bitter argument with Frazer, who accuses him of treachery when they were spying in Berlin during the Cold war. Larkin threatens Frazer with a dossier marked 'Wolfman' and next day is murdered, seemingly by a wild animal, the legendary Beast of Midsomer. Frazer's drunkard son Nicky, another ex-spy ,is killed in identical fashion but Barnaby realizes that the 'Beast' is but a cover. The true murderer is seeking revenge for betrayal back in Berlin two decades earlier when they were involved with secrets and spies.

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