Warren Murphy 
Trace [EPUB ebook] 

TRACE aka Devlin Tracy. He operates out of Las Vegas as a very private investigator. The giant insurance company that employs him is willing to overlook his drinking, his gambling and his womanizing for one reason: No matter how dirty and dangerous the job, he gets it done. Now his part-time hooker girlfriend is off on an out-of-town trick, his alimony bills are piling up, and his assignment is to find out if an idealistic doctor is dedicated to killing his patients rather than curing them. What he is about to discover is that ordinary people often have the most perverse secrets, that one unsolved death can mean open season for someone aspiring to become a career beneficiary, and that unless he comes up with some answers fast-someone might put a permanent end to him and his investigation in this dirty game of dollars and death…"