Parker, Robert B., 1932-2010. Sunny Randall novels.

"Sunny Randall's newest client, Blake, seems to have it all: he is an Instagram influencer, with all the perks the lifestyle entails--a beautiful girlfriend, wealth, and adoring fans. But one of those fans has turned ugly, and Sunny is brought on board by Blake's manager, Bethany, to protect him and to uncover who is out to kill him. In doing so, she investigates a glamorous world rife with lies and schemes...and ties to a dangerous criminal scene. When Bethany goes missing and the threats against Blake escalate, Sunny realizes that in order to solve this case, she has to find out exactly who Blake and Bethany are, behind the Instagram filters. While digging into their pasts, she is also forced to confront her own, as old friends--and ex-husbands--reappear. With a combination of old-school crime-solving skills and modern internet savvy, Sunny will stop at nothing to catch a killer"--