A new threat -- something ancient and evil -- faces the world of Erdas and four young heroes and their spirit animals are determined to stop it as they embark on a desperate journey that takes them deep underground and to the far corners of the world.

Working in separate worlds to stop the awakening Wyrm, Conor, Abeke, Meilin, and Rollan find support in a strange group of allies but will have to work quickly to locate an ancient trap that could bring about the end of the war.

"Conor, Abeke, Meilin, and Rollan are prisoners. Framed for a crime they didn't commit, the four young Greencloaks have been captured by the ruthless Oathbound. Rather than facing trial with the rest of their order, the friends and their spirit animals find themselves smuggled to a remote palace. There they discover that the plot against them runs deeper -- and is far more sinister -- than anyone realized. Someone has been manipulating both the Greencloaks...

Framed for a crime they didn't commit, four fugitives travel the deserts of Nilo looking for a secret library that houses the wisdom of Erdas and is guarded by their old friends.