Purge - Purge - Matt Johansen Crime, #1

27 year old Matt Johansen is seriously frustrated. He's been a rookie cop with Boston PD for too long: he wants one chance to prove himself worthy of the rank of detective. Newly separated from his wife and four-year-old son, Matt's living in a run-down furnished room in Chelsea. He's broke, has no gun license, no badge, and he's even lost his right to drive because of a recent DUI. But things are about to change.
Big time. Forensic Pathologist Shyla Phelps, the beautiful woman he's been chasing for two months, has finally called him. He can't wait to see her. It's Saturday night: maybe he'll get lucky for once in his miserable life. Meanwhile, on the other side of town, a grizzly murder is taking place. Lawyer Peter Mossberg, his wife Kate, and their two young boys are brutally slain. The Boston Police Department will log it as an unfortunate murder-suicide but Matt won't be so sure.
Besides, to him it'll be personal. Kate Mossberg was his long lost sister. Despite being officially warned off the case, Matt takes it upon himself to find out the truth. He may yet make a good detective - if he can just get past his issues.