With the vanquishing of the murderous Crossed Swords Guild in "Assassin Prince", no one would blame the Grey Riders for resting on their well-deserved laurels. However, the evil Ja'al cult is not done with them, nor, indeed, with the rest of the world of Damora. The Riders fly their pegasi to far-flung locales, seeking to destroy the Skull Gates, portals to hellish lands that are rumored to bring in daemons intent on mayhem and destruction. However, a sinister plot lurks in the background with catastrophic implications. And, unknown to them, two absent Riders, the beloved Alenar sisters, have been captured by the Ja'al - they have a crucial role to play in the Gates and their dark purpose. The Riders must focus their efforts on finding and destroying the Skull Gates before they can be employed to wreak havoc, all the while dealing with tremendous loss and sorrow. They will need all their reserves of faith, hope and love for each other to thwart the Ja'al plans for total world domination.