For cavemouse Geronimo Stiltonoot, life is one prehistoric problem after another!

When his cousin Trap Stiltonoot is stung by a dangerous cavefly, he falls into an instant, deep sleep! The only cure is the petals of the rare and smelly pink stinkrose. But there’s a catch — this unusual flower only grows on the top of a treacherous peak.

Together with Thea Stiltonoot, Geronimo must face dizzying heights, unexpected dangers, and the risk of going extinct before they reach their goal. Will they find the flower in time to save Trap?