Caveboy loves banging his club, running really fast, and playing with his friends, but when his club breaks, he needs to find a new one, leading him to make a new friend and discover his own bravery.

Young Hylas--goatherd, Outsider, thief--is hunted by powerful warriors who want him dead and have kidnapped his sister. Hylas is forced to flee his home, but not before a mysterious stranger gives him a bronze dagger. While on the run, Hylas must use his skill and wits to survive a shipwreck and a great white shark attack, befriend a dolphin, and help Pirra, the runaway daughter of a High Priestess. Together with Pirra, the dolphin, and the valuable...

Un misterio roedor naufraga en la Isal de los Ratones: se llama Pirat-Ruk y es un pirata prehistórico que anda tras la pista de un valisos tesors. Para Geronimo Stiltonut será el comienzo de una aventura superratónica que lo llevará a buscar el Tesoro Perdido de las Prehistorratas Piratas ... A mysterious rodent has been shipwrecked on Mouse Island. He's a prehistoric pirate, and he's searching for a lost Stone Age treasure! Geronimo Stiltonoot...