During the Civil War, Peter Warren, a tender-hearted, disowned Southern gentleman, spies for the Union Army in Fredericksburg, Virginia—a region where he is well-known. Plagued by memories of his father's brutality on their plantation, he has vivid recollections which could betray his identity with a slip of the lip. He fears being recognized as an Underground Railroad conductor since posters with his likeness blanket the South. Once he is trapped on the Confederate side of the frozen Rappahannock, will Peter choose to save his skin or fulfill his duty?