Agatha's in need of a well-earned break and with Christmas just around the corner it looks like the perfect opportunity to relax. When she receives a letter from an old lady begging for protection, she can't help but spring into action.
A year after her murder, the police re-open the case of Yvonne Harrison when they receive an anonymous letter implicating a burglar, Harry Repp, who is about to be released from prison. Supt. Strange assigns the case to DS Lewis, who is chafing at the bit awaiting his promotion to Inspector. Morse has been ill and has only just returned to work. He steps on Lewis' toes by involving himself in the case, but as the body count rises, Morse finds himself in charge of investigating a woman who had many affairs with many different men. When he learns that the dead men were in possession of large amount of cash, he suspects they were blackmailing her murderer.
一场诡异意外造成多数同学丧生,倖存的爱儿玛也失去记忆,她不仅得试著拼凑出当天的情况,还要设法想起自己的身分。