Still grappling with his loss of faith and anger towards God following the death of his father while a young boy, second-generation FBI Agent Declan Parker is called to investigate a simple complaint. Quickly discovering a dark undercurrent, Declan is unexpectedly drawn into the world of David Stanton, a man in the final stages of planning the bloodiest mass shooting in history. The lines between "the good guys and the bad guys" become irreconcilably blurred when, during the course of his investigation, Declan stumbles into the midst of a broad, sinister agenda, the aftermath of which will forever change not only his own life, but the lives of all Americans.