39 - Festive in Death (In Death #39) by J.D. Robb

It's Christmas, but Lieutenant Eve Dallas is in no mood to celebrate. While her charismatic husband Roarke plans a huge, glittering party, Eve has murder on her mind. 
The victim - personal trainer Trey Ziegler - was trouble in life and is causing even more problems in death. Vain, unfaithful and vindictive, Trey had cultivated a lot of enemies. Which means Eve has a lot of potential suspects. And when she and Detective Peabody uncover Trey's sinister secret, the case takes a deadly turn.

ID - 39