The Heretic (Templar Chronicles, #1)

Boston SWAT officer Cade Williams didn't believe in the supernatural until a chance meeting with a fallen angel left his wife dead and him hanging on to life by the thinnest of margins. When he was discharged from the hospital he discovered that not only was he scarred, body and soul, but that the encounter had left him with a few otherworldly talents of his own.

Now, several years later, Knight Commander Cade Williams runs the elite Templar combat unit known as the Echo Team, which puts him in the perfect position to search for the creature that so viciously attacked him and his family that night. His efforts yield little success, however, until a cabal of necromancers attempts to seize an ancient Templar artifact for their own nefarious purposes and gives him the first real lead he's had in ages. Cade sets out to find the necromancers and, through them, the Adversary, only to encounter something much worse...