Death Likes It Hot

In Death Likes it Hot, dashing P. R. man Peter Sargeant travels out to a posh beach community to help a wealthy socialite plan an end-of-summer party. His enjoyment of the sun, the surf, and the company of a lovely young fashion reporter is interrupted by the death of the socialite's niece: she mysteriously drowns while swimming on a crowded beach. No one suspects murder until the police find a lethal dose of sleeping pills in her system.
As Sargeant watches the police's investigation unfold, he keeps an eye on the grieving socialite; the victim's famous painter husband; a suspiciously cheery brother and sister; and a garrulous tabloid columnist. Now, instead of planning guest lists, wine choices, and menus, Sargeant is faced with a killer unlike he's ever faced: highly sophisticated, devilishly clever, and just as smooth as he is.