It's twelve days until Christmas and all of the lodgers in Maude's rooming house are getting ready for the holiday - shopping, decorating, expecting guests. Outside of their door, there's a killer loose in London. The police are clueless, the victims seem random and a different method is used each time.
The writing was clever. We have scenes from the boarding house, scenes with the police and their investigation, which are in the third person. Interspersed among them are chapters from the killer's first-person point of view, showing what they are feeling and thinking, but without giving away their identity.
I didn't love The Twelve Deaths of Christmas, the senselessness of the crimes that kept the police from catching the killer was also what kept me from really enjoying it. The end tied things together alright, but I tend to enjoy traditional puzzle mysteries and cozies more than serial killers, even when it's Christmas.