Midnight Rambler by James Swain

Jack Carpenter, an ex-cop estranged from his wife, makes a meager living helping find missing children in south Florida. Carpenter used to be the chief investigator of the Broward County Missing Persons Unit until he beat up a serial killer named Simon Skell aka the “Midnight Rambler.” Now it looks like Skell will be released from prison because the police have found the body of one of Skell's alleged victims in someone else's backyard. Carpenter is livid because he knows Skell is guilty and wonders what he can do with limited funds and resources. He dedicates himself to finding out the truth and keeping Skell behind bars because he knows he won't be able live with himself if he doesn't. Swain, the author of the Tony Valentine series, writes a page turner similar to Michael Connelly and David Rosenfelt's Play Dead. I'd love to see Jack Carpenter make another appearance.