Cy Dethan 
The Case Files of Harlan Falk [EPUB ebook] 

A respected hostage negotiation expert loses his mind when a bizarre kidnapping case results in a child’s unexplained death. His wild talk of murderous monsters born from the victim’s own imagination is impossible to believe, and the catastrophe sees him driven out of business in a cycle of alcoholism, denial and despair. Several years later, when a new case arises bearing all the hallmarks of the same killers, Harlan Falk emerges from obscurity a changed man: a monster negotiator. Using resources and methods beyond the scope of conventional investigators, he sets out to finally close the case that cost him his career.