A private investigator searches for two killers in witness protection while evading the US Marshals sworn to protect them and a hitman hired to kill them. A vigilante justice P.I. series. Finn Harding specializes in finding people who don't want to be found. Willie Baker is a grieving father hell-bent on revenge. Thirty years after his son's brutal slaying, Willie hires Finn to find the two men responsible. The only problem? They're in witness protection. Finn begins his search in the small West Virginia town where the murders occurred and tracks the killers across the country. During his investigation, he crosses paths with a tenacious US Marshal determined to protect them at all costs. After finding the murderers and learning details about their new lives, Finn realizes they aren't who they seem and struggles with his conscience. That doesn't sit well with Willie Baker or the hitman he hired to enact his revenge. Can Finn evade the US Marshals and the triggerman long enough to levy his own form of justice? The Prison Guard's Son is the third novel by award-winning author Trace Conger. It is the third novel in the Mr. Finn P.I. series.