Detective Gabriel Wager must identify a serial killer who marks crime scenes with an angel drawing while navigating a volatile conflict involving local water rights.

Wager operates within the Denver Police Department, balancing the procedural demands of a homicide investigation against the complex socio-political tensions of the region. As he tracks the perpetrator, he finds his investigation intersecting with a high-stakes struggle over natural resources that threatens to destabilize the community. The narrative follows a traditional third-person perspective, emphasizing the methodical collection of evidence and the friction between law enforcement and private interests. Wager faces both the physical danger of a killer on the loose and the logical constraints of a legal system pressured by powerful external forces.

Readers frequently highlight the grounded, realistic approach to police work that defines the series. Discussion often centers on the author's ability to integrate complex regional issues like water rights into a standard crime narrative. Critics note that the pacing remains steady, prioritizing the logical progression of the investigation over sensationalized action sequences. The characterization of Gabriel Wager is often cited as a primary draw, as he is portrayed as a pragmatic and weary professional navigating a flawed system. Many readers appreciate the atmospheric depiction of Denver, which serves as more than just a backdrop for the central mystery.