Dark Prophecy by Anthony E. Zuiker

Steve Dark is a man on a mission. He is ready to embrace his destiny, and has nothing to lose…

Steve Dark was once a lost soul, torn between his family and his one-of-a-kind talent for hunting down serial killers – especially those so-called ‘Level 26’ killers whose depravity exceeds law enforcement’s official scale of evil. In his reluctant pursuit of justice Dark once crossed the ultimate line, a line that might cause a lesser man to lose himself completely. Not Dark.

When the world took everything from him, when it destroyed the very thing Dark once lived for, it sparked a transformation that, three years later, is only just complete. Dark is now a man on a mission. A mission unbound by authorities. A mission that, at long last, allows him to embrace his destiny. Dark is finally ready – ready to take justice to the next level.