Johnny Marzo, a former Special Forces Captain in Afghanistan and Iraq is retired from the military and is now working for the FBI, fighting what the Department of Homeland Security once called Americas most serious domestic threat. Living in Bucks County, Pennsylvania with his journalist wife Carrie and their young daughter Gracie, Marzo works out of the Philadelphia office of the FBI with lifetime friend and brilliant millionaire, Brian Brain Kelly. Together they uncover a chilling plot that threatens to rip America apart. Loving husband, doting father, and fiercely loyal friend, Marzo struggles to balance his personal relationships as he tracks a ruthless killer across the Eastern half of the United States.