Voyeur — Daniel Judson

Remer was an effective Manhattan P.I. until one of his targets found a nasty way to force him into an early retirement. Since then, he has been living an anonymous life, running a liquor store in Southampton, and doing his best to stay in the shadows without ties to anyone or anything. Then a voice from his past reaches out for help, and he agrees to work one last case---a missing person---in order to escape the threat he's lived under for six years.
Trouble is, even if he finds Mia Ferrara, even if she's safe, that might not be enough.