Geronimo Stilton's ancient ancestor Geronimo Stiltonoot is back in another prehistoric adventure! Geronimo Stiltonoot and his family are off to find a cure for Grandma Ratrock's aches and pains. She's heard that a remedy hides in a legendary valley, and Geronimo isn't even sure it exists. Little does he know that getting there will be an adventure among geysers, volcanoes, and rivers of molten lava!


謝利連摩．史提頓 (Geronimo Stilton) 的老祖先謝利連摩．史提頓努特回到了史前時代，另一場精采的冒險要展開囉！謝利連摩．史提頓努特 (Geronimo Stiltonoot) 一家人出發為奶奶瑞查克 (Grandma Ratrock) 找尋治癒疼痛的藥方。奶奶說藥方隱藏在一個傳說中的山谷裡，但大家根本不確定這個藥方是不是真的存在。他們萬萬也沒想到，在到達目的地前，會歷經一連串的冒險，沿路上會碰到間歇噴泉、火山，還有岩漿！