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Sir Claud Amory's formula for a powerful new explosive has been taken, presumably by a member of his large household. Sir Claud assembles his suspects in the library and locks the entranceway, instructing them that the when the signals go out, the formula must be replaced up for grabs - no questions will be asked. However when the lights seriously, Sir Claud is useless. Now Hercule Poirot, assisted by Captain Hastings and Inspector Japp, must unravel a tangle of family feuds, old flames, and suspicious foreigners to find the killer and prevent a worldwide catastrophe.
