The Deceivers (A John Wells Novel) By Alex Berenson 

The target was the American Airlines Center, the home of the Dallas Mavericks. The FBI had told Ahmed Shakir that his drug bust would go away if he helped them, and they'd supply all the weaponry, carefully removing the firing pins before the main event. It never occurred to Ahmed to doubt them, until it was too late. When John Wells is called to Washington, he's sure it's to investigate the carnage in Dallas, but it isn't. The former CIA director, now president, Vinnie Duto has plenty of people working in Texas. He wants Wells to go to Colombia. An old asset there has information to share--and it will lead Wells to the deadliest mission of his life, an extraordinary confluence of sleeper cells, sniper teams, false flag operations, double agents high in the U.S. government--and a Russian plot to take over the government itself. If it succeeds, what happened in Texas will be only a prelude.