The movie The Sentinel was based on the book The Sentinel.
Movie details for The Sentinel
Actors on this movie include Chris Sarandon, Cristina Raines, Martin Balsam, John Carradine, Josť Ferrer, Ava Gardner, Arthur Kennedy, Burgess Meredith, Sylvia Miles, Deborah Raffin, Eli Wallach, Christopher Walken, Jerry Orbach, Beverly D'Angelo, Hank Garrett, Robert Gerringer, Nana Visitor, Tom Berenger, William Hickey and Gary Allen.
Book details for The Sentinel
Gerald Petievich also wrote To Live and Die in L.A. (1984).
When a White House agent is murdered, Special Agent Pete Garrison fears he is being framed.
A blackmailer has compromising pictures of him with the First Lady... Evidence that would give Garrison the perfect motive for murder. To clear his name, he must infiltrate the President's most powerful circles of defense, outguess a killer's next move--and trust no one.