It's the ultimate locked-room mystery! Hercule Poirot is imperiously summoned by an aristocrat to investigate a case of fraud. But upon arrival, Poirot finds him shot dead in his locked study. A suicide? Poirot has his doubts, and the shattered mirror provides the essential clue. Performed by the actor known as Poirot's assistant, Hastings, on the TV series. 17th in the series.