It's Christmas time, and the sisters of St. Frideswide cannot turn away travellers - even the theatre players knocking at the nunnery door. But along with the motley troupe comes the grievously wounded husband of the cloister's scullery maid, Meg. The actors swear they found the drunken wastrel in a ditch, but their tale sounds remarkably like another song and dance. Especially when two dead bodies are found waiting in the wings...Now, Sister Frevisse must find out if one of the actors is a murderer in masquerade or face a deadly Yuletide season..