Former Navy SEAL Jedidiah Johnson returns to Nashville ready to begin his training with the elite warriors known as the Shepherds. He thinks he knows what to expect when he arrives on the sprawling, state-of-the-art facility but quickly realizes he'll have to find his place as the rookie leader of a new team. Then he starts having visions of an imminent attack overseas, and with the clock ticking, Jed and his team are dispatched to neutralize the threat. All the while, Jed hears whispers of another threat . a name that raises unexplained fear and anger throughout the Shepherds organization.