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. Sarah's surprise visitor brings danger to the group hidden underground, and draws the draks from above. Glenn and Ashari must bury conflict and join as brothers to wield the power to help Crystal.

As the draks close in for the kill, external and internal worlds erupt in chaos. The only way to restore order is for Crystal to become someone greater than herself and learn the third way of time travel. A way that will mean the end to life as they know it.

As the third and final book in the Naked Worlds trilogy, Crystal's Skull resolves the issues of the time loop trapping humankind and answers the questions about the Great Change. The third way of time travel is revealed in a shocking conclusion.