The Drowning Pool

From the back cover of first Pocket Book edition:
"A voice whispered: 'It's me.'
'Don't play hiding-games,' detective Lew Archer snarled. 'A .45 slug would play hell with your constitution.'
'I like my constitution the way it is. Don't you, Archer?' Her beautiful blond head appeared at the edge of the pier. She held out her hand. It was cold as a fish.
When Lew Archer met sultry Mavis Kilbourne, he knew there would be trouble. He expected her to lie to him. He expected her to cheat on him. He expected her to be mixed up with the vicious killer he was after. But what Archer didn't count on was the sweet-looking torture-chamber her friends had rigged up for his benefit!"

The Drowning Pool
First Pocket Book edition, 1951.

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Trivia:
The Drowning Pool was dedicated to Anthony Boucher, who was one of the first critics to recognize Millar. Boucher once urged Millar to write a detective short story which won a $400 prize from Ellery Queen's Mystery Magazine.
It was also the novel that introduced the themes of concealed parenthood and distressed children, something that would turn up in many of Millar's plots over the years.