The Drowning Pool

From the first page of first Bantam edition:
'The Los Angeles suburbs attracts some curious people. Danger makes them murderous. Lew Archer expected trouble from a lot like this...
...Maude Slocum, unhappy wife, over thirty but still in the running - running from blackmail.
...James Slocum, man with a bit of a sex problem, who knows that his wife's child couldn't possibly be his.
...Cathy Slocum, nearly sixteen and very advanced for her age in more ways than one or two.
...Ralph Knudson, a police chief with a past - and almost out of future.
...Mavis Kilbourne, who wanted to live, preferably on somebody else's money.
And they all nearly went down together in THE DROWNING POOL.'

The Drowning Pool
First Bantam edition, 1970.

Trivia:
With The Drowning Pool Millar altered his pseudonym to John Ross Macdonald after John D. MacDonald protested. He identified John Macdonald as Millar, and pointed out that the by-line similarity was confusing readers and editors. Since John D. MacDonald was his real name, he requested that Millar choose another psedonym.