Hercule Poirot finds himself trying to solve the mystery of the Cloade family. Rosaleen is the young widow of Gordon Cloade who was killed in a gas explosion in his London home. Rosaleen has inherited her late husband's substantial fortune and she and her brother David Hunter are refusing to share it with other members of Gordon Cloade's family. There have been persistent rumors that Rosaleen's first husband, an intrepid explorer, is still alive and as such would nullify her marriage to Gordon. What Poirot learns however is of a far greater deception that will alter everyone's perception of what they believe to their reality.