A shooting in broad daylight in the city of Waterloo, Iowa leaves two dead. Investigators Camarata and Moller follow a trail of bloody footprints to a list of suspects and an unexpected lead from a knowledgeable confidential informant.

When a hardworking single mother with a history of heart issues is found dead on the front steps of her home, detectives assume she died of natural causes. However, as the investigation progresses, it becomes clear foul play was involved.