This is the final book in the Heaven and Earth trilogy, following 'Ferren And The Angel' and 'Ferren And The White Doctor'.
Ferren, Shanna, Kiet, Zonda and Miriael, the angel, are the travelling from tribe to tribe trying to form a Residual Alliance. Unbeknownst to them Asmodai, the fallen angel, is ready to strike against both heaven and earth. The powers of heaven have no choice but to ally with the Residuals in order to prevent an apocalyptic war that will see the total destruction of heaven and the subjugation of the earth.