Unleashed Fury — Kathleen Marie Lunetta

This book tells of the continuing struggle between good and evil, as Bret and Rikki must fight Satan's world of evil, minus their courageous sister. To their horror, they learn that their cousin Crystal, is now a warrior, and the new evil force that has arrived, is determined to destroy every Warrior of the Son, off the face of the Earth. Can they help stop this new force, or will the obstacles and tragedies in their way, stop them cold?