Marple is extremely proud when she is appointed to the board of trustees of a merchant marine training vessel whose mission is to rehabilitate young criminals. As in all of her endeavors, Miss Marple intends to take an active role in the job and even shows up to the board meeting dressed in naval blues. When a fellow trustee is poisoned just prior to his making some kind of revelation, Miss Marple decides to use her position to spend time on the ship. This upsets the vessel's fragile social network as she dispossesses blustering Captain Rhumstone from his quarters. When two ship's officers are later found murdered also, Miss Marple enlists help from her friend Jim Stringer and Inspector Craddock to expose the murderer.有精明的人马上举手高呼：“听从楚队长命令！服从楚队长安排！坚决跟着楚队长走！”有人带了头，就连凌风也跟着瞎喊，实际上他心里不情愿，但无可奈何，他在楚翔眼中还不如以前的小瘪三阿力吃香呢，如果不表现积极些很可能被撵出新基地。