Twin Falls pathologist Toni Day is on a Caribbean cruise with her husband and parents when she is jerked out of a peaceful slumber by a horrific scream. After several unsuccessful attempts to reclaim sleep, Toni heads to the ship's deck to read. But shortly after the sun rises, everything changes when a mangled body plummets from the roof into the pool next to her. Rather than flee in horror, Toni teams up with her stepfather, Nigel, and Scotland...

"Pathologist Toni Day and her husband, Hal, are mystified when she starts receiving grisly Christmas cards depicting murders, each accompanied by a twisted verse from The Twelve Days of Christmas, and she and her partners are suddenly inundated with autopsies on the corresponding bodies. The victims are members of a jury that convicted Toni's old boyfriend Robbie of kidnapping and sent him to prison. Robbie is now out on parole and is presumably systematically...