Harry is looking forward to her first Christmas at Hawthorne, Aubrey's country house. She wants cheerful fires, snow-filled landscapes and pleasant company, all of which seems entirely possible. But her dreams of a perfect Christmas are thrown into chaos with the arrival of Sylvia Morwell, a girl who is universally disliked by everybody who knows her. Unfortunately, that includes most of Harry's guests and suddenly, the atmosphere could could be cut with a knife!As uncomfortable as this may be, things take a turn for the worst when her unwelcome house guest is murdered, done to death with a poisoned plum pie. Once again Harry, Aubrey, Charlie and Darcy must delve deep to discover the killer that lurks in their midst. And they must move fast before Harry's Christmas is entirely ruined!