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In the short story The Unbreakable Alibi, Delphiniums Blue is a show at the Duke's Theatre. Una Drake claimed, as one of her two conflicting stories, that she had gone to see the show. Tommy and Tuppence have the counterfoil of the show ticket as proof. Jimmy le Marchant did not quite remember the name of the show and called it Pink Peonies or something like that.

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