Poptropica 1. El Misterio del Mapa, Paperback

In El misterio del mapa, Oliver, Mya, and Jorge take a ride in a hot-air balloon, only to crash-land on an unknown island filled with extinct animals and a horde of angry Vikings. Welcome to Poptropica, an uncharted group of islands whose existence is hidden from the rest of the world. As the three friends embark on a perilous search for a way home, they quickly discover the shocking reason they were brought there--something that threatens the very existence of Poptropica and their ability to ever make it off the island