PASSIONS AND FEARS EXPLODE when a crystal skull hidden in the sanctuary's core summons Crystal. Slipping into Fredrik the Wizard's book, Crystal learns what she must do to help the humans escape the skin slicker rain of terror. But Sarah's surprise visitor brings danger to the group secreted underground, drawing the draks from above. Glenn and Ashari must bury conflict and join as brothers to wield their mysterious power to help Crystal, while the rag-tag team chooses to follow someone no longer human. As the draks close in for the kill, external and internal worlds erupt in chaos. To restore order and set the world aright, Crystal must transcend her humanity and detonate the third way of time travel. A way that could mean an end to life as she knows it. The third and final book in the Naked Worlds trilogy, CRYSTAL'S SKULL resolves the issues of the time loop trapping humankind and ushers in the Great Change.