The start of a stirring fantasy trilogy from Emily Rodda, the internationally bestselling author of Dragons of Deltora. The walled city of Weld is under attack from ferocious flying creatures that raid in the night, bringing death and destruction. The Warden calls for Volunteers to find and destroy the Enemy sending invaders, and the heroes of Weld answer the call one by one, never to return. Rye is officially too young to go, but his brothers are among the lost and he must find them. What terrors await him beyond the Wall?

Three magic Doors you here behold. Time to choose: Wood? Silver? Gold? Listen to your inner voice, And you will make the wisest choice. Rye is willing to risk everything to save his brothers, lost in the terrifying world beyond the Wall of Weld. Sonia is determined to find and destroy the Enemy who is sending the ferocious flying beasts called skimmers to ravage the city. The companions barely escaped with their lives during their first thrilling adventure beyond the golden Door. But they won't give up. Their desperate quest must continue. Deep in the ancient heart of the Keep of Weld, two more doors await them.

Rye and his friends have survived the perils of the first two doors. Now, to save their home, they must journey through the Third Door.