A merry Christmas celebration in a rich country mansion ended in a scandal: the owner of the house quarreled with the guests, and finally promised to disinherit his nephew. And in the morning the owner of the mansion was found dead in the bedroom, with a dagger in his chest. Inspector Hemingway, leading the investigation, is sure that his nephew killed his uncle, because he had a serious motive. The evidence points to this. But others present also had reason to wish him dead. No one has an alibi...