When a band of robbers menaces the realm, the Duke of the Winter Castle sends his enchanted, crystal-tipped sword to his friend Matěj the blacksmith for sharpening, only for the magical gem to vanish without a trace. As Matěj joins the Duke’s campaign to reclaim the blade, the Duke’s daughter Johanka and a spiteful curse from the smith’s heartbroken wife threaten to derail their quest and doom the kingdom.