Watch your step, because things are about to get incredibly hot! In this hilarious trip back to the Stone Age, Geronimo Stiltonoot is setting off on a noble mission. He urgently needs to find a special cure for Grandma Ratrock's aching bones. Rumor has it that the perfect remedy is hidden away in a mysterious, distant valley. Geronimo thinks this will be a quick, simple trip, but he is terribly wrong! You will have to help him dodge and weave as his peaceful journey suddenly transforms into a wild obstacle course. Get ready to sprint past exploding geysers, leap over rumbling volcanoes, and carefully navigate around bubbling rivers of completely molten lava! Can this prehistoric hero survive the heat and bring the medicine back home safely? Jump into this fast-paced chapter book for a sizzling adventure packed with laughs and thrilling escapes.