In the middle of the Mexican jungle a small scientific team prepare to embark on an exploration of the world's deepest sinkhole; a naturally-formed underwater shaft that no one has ever reached the bottom of. What they are about to discover could change the world forever.
Sam and Skipper are back. But the Aurobon they return to is vastly different from the one they left. Vahlzi is in ruins and all that remains of Firebrand's forces are scattered groups of resistance fighters. Odoursin now rules Aurobon, using his terrifying army to enslave the people and destroy all who defy him...