Not long after donning the uniform of the McCreary County Sheriff's department in Bone Gap, Tennessee, ex-Marine Brynn Callahan faces her first official homicide. On a cold February morning, a lone cross-country skier stumbles across the mutilated body of a young woman. Sent to investigate, Brynn is shocked when she recognizes the victim as a fellow Traveller, Maura Keene. Maura held a solid standing both within the Travellers' insular community and among the settled townspeople--a fact that makes her murder all the more disturbing to Brynn, who also straddles the two worlds. After her trained K-9, Wilco, digs up human bones, and then a scrap of paper scrawled with arcane Latin phrases is uncovered, Brynn finds evidence leading her to question those closest to her--and closing the case becomes a deeply personal matter.