Sea Monster Surprise (Geronimo Stilton Cavemice #11)

For cavemouse Geronimo Stiltonoot, life is one prehistoric problem after another! Bart Barnacle, the prehistoric pirate, has been visiting the cavemice, and it's up to Geronimo Stiltonoot to accompany him on his long, treacherous journey — during which they'll encounter megalithic danger and hungry sea monsters.