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!

"Mystery, action, and big laughs . . . this book's got it all." --Jeff Kinney

"Bright, animated colors and zippy cartoonlike action make for an easily accessible first offering that provides just enough exposition to hook young readers and keep them seeking out subsequent adventures. A peppily paced adventure yarn sure to delight fans of the franchise, both old and new." --Kirkus Reviews