Geronimo Stilton Cavemice #3: Help, I'm in Hot Lava!

Geronimo Stiltonoot is off to find a cure for Grandma Ratrock's aches and pains. He's heard that a remedy hides in a mysterious distant valley, but he's sure that he'll be back home in no time. Little does he know that his journey will become an adventure among geysers, volcanoes, and rivers of molten lava!