Caleb Jacobs is a man with a past. After serving on a failed dark ops assignment in Afghanistan, he leaves Marine Corps Intelligence to try to build a new life in Philadelphia as a homicide police detective.

Jacobs is happy, for a time, until he is assigned to solve the murder of Shannon Faraday. During the investigation, he is convinced the evidence points to him as the killer. He knows it is only a matter of time before other investigators see the same. He has no alibi and the clock is counting down.

Behind his partner’s back, Jacobs hires a private investigator named Lawrence Holmes. The PI is an irritation to the police, but he is unmistakably brilliant. And, many powerful people in the city owe him favors. Holmes is a bit odd. He insists on calling Jacobs Watson but claims to never have heard the name Sherlock. Jacobs can live with this kind of crazy as long as together they find the real killer.

They quickly link the murder to a series of seemingly unrelated crimes occurring throughout Philadelphia, and Jacobs becomes convinced the murder is related to the truth of what had happened during his time in Afghanistan. Old secrets have come back to haunt him.