The Mongol's Coffin (Bone Guard Series #1)

They used to be part of a special ops intelligence group known as the Unit-until the brass ignored their intel, and they followed Lieutenant Grant Casey into a firestorm to save a museum, and the people trapped inside. The aftermath leaves Grant and his wingman in the hospital, and his whole team on the outs with the military. After his discharge, Grant fuses his interest in history with his specialized training, and the Bone Guard is born. The Bone Guard. . .where adventure and history ign...