The Nightingale Before Christmas by Donna Andrews
As the holidays draw near in Caerphilly, Mother volunteers to be in a Christmas decorator show house-each room of a house is decorated to the hilt by a different decorator for a public tour. Of course, Mother insists that Meg pitch in with the organisation, and she finds herself surrounded by flamboyant personalities with massive egos clashing. Then someone starts sabotaging rooms, and the most cutthroat of all the designers is found dead. Can Meg catch the killer in time to prevent another murder? And how will she finish the house on time when the rooms keep turning into crime scenes? The Nightingale Before Christmas is guaranteed to put the ho ho hos into the holidays for the legions of fans hungry for another Meg Langslow Christmas book.