A.E. Stanfill 
The Ninth Precinct [EPUB ebook] 

Private detective Grant Dawson is looking for his first big money case. When the mayor of a small town calls him to help solve a murder, he doesn’t think twice — especially since the money offered was right up his alley.
But nothing would prepare him for the horrors he would face. His body and mind will be pushed to the limit, as the line between right and wrong blurs.
Can Grant solve the case, or will he be driven mad by the killer’s mind games