Deep Freeze - John Sandford

Deep Freeze is the tenth novel in the Virgil Flowers series. They're all excellent.

Virgil is on vacation when his boss calls. It sounds like there's more trouble in Trippton Minnesota. Virgil has already put a whole bunch of Trippton residents in prison. (Read the novel Deadline.) Now there are two things going on in Trippton that require Virgil's attention. A woman's body showed up in the frozen river, and someone is making obscene Barbie dolls. Virgil gets all the good cases. Very highly recommended.