He's a hardened homicide detective.

She's a do-gooder social worker.

When their worlds collide, more than murder is exposed.

Detective Spinelli's life is tossed sideways when he is reassigned from the Homicide division to assist in the Child Services division of the Social Services Department for the holiday season.

Caseworker Shannon O'Hara moonlights as Santa Claus's little helper at the mall, and when Santa and an elf turn up dead, she appears to be next on the killer's list.

Spinelli and Shannon are forced to work together to solve the murders and keep Shannon from becoming the next victim. The trouble is they have wildly different philosophies about dealing with clientele and how best to solve these crimes. Their unwanted attraction to each other triggers additional stress for the two. Will Spinelli be able to complete his job without losing his heart?