What started out as an enjoyable Christmastime house party at Sir John Tittleton's luxurious London home has turned into a veritable nightmare. A stranger has been found in the back alley, stabbed to death, and everyone in the house is a suspect. As Jessamine Warbling, a fashionable young lady, decides to give Scotland Yard a helping hand, she discovers that almost all of her friends had a motive to kill this man. But which one is the murderer, and is he, or she, desperate enough to strike again? As Jessamine Warbling, Inspector Fionn, and the Tittletons dig into the case, they take a gruesome look at human nature and learn just how far a person will go to save his own skin.