Find you in the dark

"For years unbeknownst to his family Martin Reese has been illegally buying police files on serial killers and using them to find missing bodies. He keeps photos then turns in the results anonymously. Martin sees his work as a public service. Detective Sandra Whittal sees it differently. On a meteoric rise in police ranks Whittal is suspicious of the source she calls the Finder. Even if he isn't the one leaving the bodies how does she know he won't start? Then on his latest dig Martin finds a freshly killed body lying among the remains."