Two brothers encounter danger and adventure in a world of the future in this classic dystopian novel from Newbery Medalist Susan Cooper. On their idyllic Bahamian island, Trey's little brother, Lou, is different. He doesn't speak and suffers from frightening seizures. But when he and Trey find themselves mysteriously transported to Pangaia, an Otherworld where pollution and over-development have all but destroyed nature, a militant environmental group greets Lou as the prophesied hero who will save their world.

But to realize this prophecy, Lou must take Trey on a terrifying and dangerous mission, with much more at stake than the fate of Pangaia--and it's not all in the future. Does Lou have the power to save his present-day island home from developers who will turn it into their own version of Pangaia?