Leonard Weardale

In the short story The Submarine Plans, Leonard Weardale is the son of Sir Harry Weardale, a British admiral and the First Sea Lord and his wife Lady Juliet. The family were guests of Lord Alloway at his country home at Sharples when the plans for the new z-class submarine were stolen at night. At one point, Leonard's mother suspected that he had stolen the plans. Poirot however knew this could not be because at the time of the theft, Leonard was on the stairs trying to kiss the French maid of Mrs Carson. Why Lady Juliet suspected Leonard is not clear but Poirot surmised that it might be because she had gone to his room and found him absent. She then got suspicious when Leonard lied, saying that he had retired to his room for the night and had never left it.