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 Cheesy-La, a legendary valley that Geronimo isn''t even sure exists. Little does he know that getting there will be an adventure among geysers, volcanoes, and rivers of molten lava!