After a gruesome murder at the Carlton County Livestock Feedyard, the KBI enlists Undersheriff Lottie Albright to work undercover. Agent Dimon believes Sheriff Sam Abbot is turning a blind eye toward illegal activities between the bullhaulers and Mexican immigrants working at the feedyard.
As a cover for her sleuthing, Lottie calls for stories from Mexican families whose ancestors were part of colonization groups into Kansas. Francisca Diaz, a mysterious old Spanish woman comes into the historical society to contribute her family history. When she is brutally murdered, the family's history overlaps with the murder at the feedyard.