This Grimm fairy tale tells of a princess trapped in a magical glass mountain by a mysterious underground dweller called Old Rinkrank, forced into servitude for years until she devises an escape. Originally collected by Jacob and Wilhelm Grimm in the 19th century, this story exemplifies the Brothers' fascination with transformative trials and trickster reversals common to European folk tradition. Readers should expect a classic fairy-tale structure with magical challenges, clever wordplay, and ultimate justice through wit and courage.