Beware! They have caught up with him... Late summer at the Rodenberger windmill: The life of a man ends in a mysterious way - he was shot with forbidden war ammunition. Chief Inspector Wolf Hetzer discovers an engraved metal plaque from 1880 near the crime scene, which he initially believes to be a relic from the early days of the mill. However, as further clues point to the past of Bohemian gunsmiths, Hetzer begins to doubt whether he has inadvertently taken something relevant to the case. But how does everything fit together? His own secret investigations make him increasingly restless. Does his fiancée have something to do with the case? His inquiries lead him not only to the Ore Mountains but also into the depths of inhumane actions... the shadows of the past.