«Bullet for a Star» by Stuart Kaminsky

Hollywood detective. Toby Peters does a job for one of Tinseltown's finest.
It's been four years since security guard Toby Peters got fired from the Warner Brothers lot for breaking a screen cowboy's arm. Since then he's scratched out a living as a private detective — missing persons and bodyguard work, mostly — but now his old friends, the Warners, have a job for him. Someone has mailed the studio a picture of Errol Flynn caught in a compromising position with a very young girl. Although Flynn insists it's a fake, the studio is taking no chances. Toby is to deliver the blackmailer $5,000 and return with the photo negative. It should be simple, but Flynn, a swashbuckler on and off the screen, has a way of making things complicated.
Though he isn't impressed by movie stars, if Toby Peters isn't careful he may end up dying for one.