Lucia, wife of Sir Claude Amory's son Richard, Dr Carelli and Babara are all having coffee when Sir Claude announces that a new explosive formula has been stolen from his safe and that he has sent for Hercule Poirot. To enable the thief to replace the formula he orders the lights to be turned out but when they are switched on again and as Poirot enters, Sir Claude is found poisoned. Poirot sets about his investigation, foils the murderer in a second attempt and cleverly tricks him into betraying himself.

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