Floyd Mahannah wrote five or six mystery novels and (as far as I know) disappeared. Too bad. I've read a couple of his books, and both were very good.
In this one, a gent named Riley Wadell is getting out of the p.i. game because it's a "stinking business." He's quitting with no more regret "than you'd feel about getting fired off a garbage truck." But wouldn't you know it? On the very day he's calling it quits, a dame comes into his office with a job offer. He turns her down, but later she's back, and this time she's offering him $15K to hide her for two weeks. It seems that someone's killed her husband, and she's the most likely suspect. Waddell thinks she guilty of murder, but the money convinces him to help her. During the two weeks, Wadell and the woman become lovers, but he still turns her in when the time's up. Then he goes away to start over.
But of course he can't forget her, so he returns to do what he can to help. Before long he begins to think she's innocent, and things get a lot more complicated.
Mahannah was a darned good writer, and after reading this book, I wonder again whatever happened to him.