Army Sergeant Ryan Henderson was a little hesitant to get to know the dog he had been assigned to work with. But once he got to know the all-black German Shepard, Satan, he was thrilled to be working together. Tasked with detecting explosives, the duo had completed countless missions during their eight months in Afghanistan. Sgt. Henderson and Satan had become inseparable. Until one-day, Sgt. Henderson suffered a grand mal seizure and had to be flown to Germany to be treated. After recovering, Sgt. Henderson was dedicated to finding Satan but it was five long years before they could reunite.