Veritas: A Neil Baggio Suspense - Neil Baggio Universe, #1

Book One of the Neil Baggio Universe Series Neil Baggio has adjusted to life after the Bureau, finally accepting he may never close the case of his mentor-turned-famed-killer, Cappelano. But Cappelano isn't finished with his student yet. Neil is still in need of his teachings, and Cappelano will do everything in his power to finish the lesson. After a rash of killings by Cappelano, Neil is drawn back into the Bureau and his unfinished business with his mentor.
But to finally put things to an end, he won't play by the Bureau's rules again. He'll have to color outside the Bureau's lines if he's going to catch Cappelano once and for all.