Bart Millard, lead singer of MercyMe, faces a personal crisis at the peak of his success. As his world unravels, he struggles with his beliefs and inner demons while seeking a path through adversity.

 前海豹突击队员凯西·达顿离开黄石牧场，加入美国法警队，利用他的牛仔和军事技能在蒙大拿州打击犯罪，同时还要处理家庭关系和执法工作带来的精神压力。