Against All Enemies (Jonathan Grave #7) by John Gilstrap
Jonathan Grave finds it hard to believe that a fellow combat vet has gone rogue, killing American agents and leaking sensitive intel to hostile foreign interests. With black ops assassins on the trail of his old friend, Grave sets out to get to him first. He finds far more than he bargained for. Not only the wily operative, but evidence of a conspiracy so dangerous, so far-reaching, that an unthinkable tragedy is in-motion. Grave and his elite team of specialists must expose a deadly high-level secret —and do it in time to avert a catastrophe of historic proportions…


High Treason (Jonathan Grave #5) by John Gilstrap
First Lady Anna Darmond has been kidnapped in a bloody gunfight. It's an unthinkable crime that, if revealed, could cause public panic, so hostage rescue specialist Jonathan Grave and his team must operate in absolute secrecy. But the mission is not all it seems. There are shadows in Mrs. Darmond's past. Cracks in the presidential marriage. Leaks in the country's critical shields of security. As Grave tracks the missing First Lady through a labyrinth of lies and murder, he confronts a traitor at the highest level of Washington power--and a devastating scheme to bring a nation to its