Crime Paradise by Gene Desrochers

After his girlfriend ditches him at a concert, private investigator Boise Montague makes the latest bad mistake in a long line of them. Only this time, instead of waking up with a hangover and some woman he doesn't know, he wakes up with a hangover on a Caribbean beach, along with three women.
All of whom are dead.
With the dead women's blood all over his clothes, no memory of what happened, and no way for Boise to explain it, the cops and the prosecutors think it's a slam dunk. Boise knows he didn't do it, but no one's willing to listen-so he'll have to find the killer himself.
But whoever said the truth will set you free never saw anything like this. The people behind it are powerful, careful...and they want Boise out of the picture for good.
Soon, Boise will face not only present danger, but past pain, because the deeper he digs, the more skeletons he finds. And some of those skeletons are his own. But will he finally bury them-and the past-or will those skeletons bury him instead?