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Richard Rollison, otherwise known as the Toff, has become lethargic. Even his passion for solving difficult criminal cases seems to have waned. Aunt Gloria arranges a birthday party so as to cheer him up, but it ends in disaster as one of his souvenirs - a tube of arsenic - disappears, with the contents later re-appearing in the ice-cream. The Toff is spurred into action and the master investigator has to solve one of his most difficult cases ever.