Someone has stolen a valuable formula from Sir Claud Amory, Britian’s leading physicist. As he announces the theft at a dinner party;  Sir Claud outlines the suspects:  his son, Richard Richard’s wife Lucia his sister Caroline his niece Barbara his secretary Edward Raynor  and Dr. Carelli  an unexpected Italian guest who has stopped to visit Lucia.  Sir Claud has already asked for help in retrieving the formula from Hercule Poirot  who shows up as scheduled ready to solve the mystery with help from his friend Captain Hastings.Rounding out the cast are the butler Tredwell Inspector Japp and Dr. Graham

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