Trey and his troubled but sensitive brother Lou live in the Bahamas and have grown up in the home of their grandparents, exploring around Long Pond Cay. Their way of life is threatened when ruthless developers see the financial possibilities of the area. Then they accidentally enter a parallel world called Panagaia, a horrifying vision of the future where greed, overpopulation and technology have shut out the stars and choked everything green. Carried between the two worlds in a zigzag adventure of mounting tension and danger, the children risk their lives not only to save the alien world but also to ward off the threat to Long Pond Cay.