In his continuing adventures, Twig, now sixteen years old, joins the crew of his father's sky pirate ship and embarks on a dangerous mission to collect the powerful stormphrax, a substance that purifies water and also prevents the city of Sanctaphrax from floating away.

Since his childhood in the DeepWoods, young Twig has always longed to soar above the forest canopy and explore the sky. Now a crew member on his father’s sky pirate ship, the Stormchaser, his dream seems fulfilled. But a much higher destiny awaits Twig. The lofty city of Sanctaphrax—built on a giant rock, floating high in the sky—is at the point of disaster. The city’s future is dependent on stormphrax—a valuable substance available only from the heart of a Great Storm. And only the Stormchaser, with Twig onboard, could risk entering a storm. . . . From the Hardcover edition.

Twig, a young sky pirate captain, is the only one who can save the floating city of Sanctaphrax from the Mother Storm. [verso].

Abandoned at birth in the dangerous Deepwoods, young Twig has been brought up by a family of woodtrolls. Now he sets out to discover his true identity.

The son of a sky pirate captain is plunged into a terrifying adventure when he accidentally invokes an ancient curse.

Three stories from The edge chronicles featuring the hero Twig.