Thomas Mundy checks in to London's Wrexley Hotel, but he never checks out. The maid finds him on the floor of his room, bludgeoned to death by his own walking stick. Inspector Witherspoon is soon on the case and learns Mundy had a reputation for being polite, charming, and diligent-- an unlikely victim for such a violent crime. But Mrs. Jeffries and the household staff uncover that Mundy was less an amiable businessman and more a duplicitous con man with enemies on both sides of the Atlantic. Now Witherspoon and his staff must determine who on their lengthy list of suspects had the motive to put Mundy in the red.