El castillo de Roca Tacaña

Geronimo Stilton hates to travel, so when an invitation arrives from a long-lost relative, he's less than thrilled. Despite his reluctance, his friends Thea, Trap, and Benjamin drag him along on a journey to the eccentric castle on Penny-Pincher Peak. What could possibly go wrong at a place called Penny-Pincher Peak, especially with rat-chewing rattlesnakes around?