While on vacation in Florida with his family, Detective Ronan O’Mara gets the one call every police officer dreads; his former partner, Shane Matheson, is dead. Retired and living in sunny St. Petersburg, Florida, Shane took a job as a mall Santa. When Shane doesn’t make it home after a Friday night shift, he’s found dead in the mall parking lot, still dressed as jolly old St. Nick.

Psychic Tennyson Grimm is looking forward to spending his vacation with his brother, River, playing in the ocean with his kids, and working on his tan. Helping to solve a Christmas murder was not on his vacation bingo card. Nevertheless, Ten joins the hunt when the killer strikes again.

Working in conjunction with local police, Ronan realizes the killer is the last person he would have imagined. Can Ten and Ronan stop the killer before he adds someone else to the naughty list?