As Rollo, the troll leader, escorts Clipper to her people in the Forbidden Forest, Ludicra decides to send a rescue party in search of Rollo, but in the Great Chasm, the rescue party itself runs into trouble.
Thirteen-year-old Milos and his Cryptoclidus friend Lilith help rescue a sailor in the open sea beyond Dinotopia's coral reef, but unlike most of the shipwreck survivors welcomed into Dinotopia, Joshua is determined to return to his own world.
Rollo, a young troll from Bonespittle, wants to help build a bridge across the Great Chasm to the Bonny Woods, but he must face his fear of the terrible creatures that he has always been told live there.
Thirteen-year-old Magnolia and her dinosaur partner, Paddlefoot, must discover why the Polongo River has dried up before it causes a disaster for Waterfall City, on the magical island of Dinotopia.
