If you confront anyone who has lied with the truth, they usually admit it — often out of sheer surprise. It is only necessary to guess right to produce your effect.

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Notes from Wikiquote

3.7 The Identity of Mary Debenham

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Quote text and notes from Wikiquote: Agatha Christie (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.