What lurks beneath the ice?Marine biologist Sam Aston is hired to explore a series of subterranean caverns deep beneath the Antarctic. Somewhere within this lost world of magnificent caverns and underground seas lies a source of limitless clean energy, but something guards this treasure. As enemies bent on obtaining this world-changing resource for themselves close in from above, Aston and his team plunge further into the depths, and discover they are not the first to come this way . . . and they are not alone.As the death toll mounts, Aston and his companions are forced to uncover secrets hidden far beneath the ice. Danger lurks at every turn as they face the deadly threat of the Overlord.