The Sentinel by Gerald Petievich
Approx. 88,070 words.
Published on October 6, 2010.
A White House Secret Service agent has been blown away by a masked gunman. A neo-Nazi group has taken credit, but Special Agent Pete Garrison fears it's more than a warning shot delivered by extremists. An informant claims the group has one of its own in the W.H. A blackmailer has photos of Garrison in an affair with the First Lady, evidence that gives Garrison the perfect motive for murder.