Sir Dennis Galt, a senior British Civil servant, has been playing away whilst his wife is on holiday in Bermuda. When he learns that she is due home he breaks up with Magda, his mistress, but she runs off with a diamond brooch belonging to Galt's wife that he has lent her. To avoid scandal Galt asks McGill, not the police, to retrieve it before his wife returns and an irritating jeweller tells her what has happened. Magda claims to be from an aristocratic Austrian family who live in a castle but nevertheless her boyfriend Johnny is a ne'er-do-well who wants to sell the brooch to pay gambling debts. McGill sets out to stop him.
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