Breakdown (Alex Delaware #31) by Jonathan Kellerman

In #1 New York Times bestselling author Jonathan Kellerman’s thrilling new blockbuster Alex Delaware and Milo Sturgis investigate the murder of a Hollywood actress pushed to the limits of sanity.

Psychologist sleuth Alex Delaware is surprised to get the call when well-known TV actress Zelda Chase turns up half-naked, half-mad in the LA’s rural Westside.
He has little connection to the starlet, save a psychiatric evaluation he performed on her adopted son several years ago, a child who has since vanished without a trace and whom Zelda refuses to talk about.

When the actress turns up dead a few weeks later without a scratch on her, Delaware calls in police lieutenant Milo Sturgis to help him crack the case—or at least the wall of silence surrounding it.