Immoral Certainty (The Butch Karp and Marlene Ciampi Series‪)‬

Butch Karp's career prosecuting New York's worst criminals takes a chilling turn when a series of ghastly child murders opens a window into the city's hellish underworld. Karp and love-interest Marlene Ciampi pursue a psychopath known to his young victims as the Bogeyman, but what they find is more threatening than a lone predator. To stop the evil they unearth will take more than just courage in the courtroom; the two will need to follow a sinister trail into New York City's darkest corners, where the law is powerless to protect them.