Lief, Barda and Jasmine face a terrifying race against time to find and destroy the Four Sisters, evil creations of the Shadow Lord's sorcery.

The Enemy has been exiled, but he has not yet been defeated. Thanks to an ancient plot, his shadow still stretches over Deltora.

For centuries the vile Sisters, hidden in the four corners of Deltora, have been spreading their poison and singing their songs of death and despair. Now, their work is nearly done. Deltora is free, but it is dying. Only weeds and monsters thrive. The people are starving. And the Shadow Lord gloats in his stronghold beyond the mountains, planning his triumphant return.

In secrecy and in haste, guided only by fragments of an ancient map, the companions plunge headlong into a quest that takes them to the wildest places in the kingdom, and puts them face to face with fearsome enemies. They soon learn that even the magic of the Belt of Deltora is not enough to combat the power of the Four Sisters. Their only chance is to use a dangerous secret weapon. They must wake Deltora's last seven dragons, which have been deep in enchanted sleep for centuries. Only when the mysterious power of the dragons joins with the magic of the gems of the Belt of Deltora can the Sisters be destroyed.