Life on Mars? True - after all, there are the human colonists of Cinnamon Sands. But maybe there is something else as well. Following his adventures in the "Ghost Caves of Mars", William Glenn has been hearing things. He thinks he's going nuts until his best friend says he's heard it too. Maybe they woke something in those caves - something that slept beneath the desert for a long time. Every day it gets a little closer - will there be danger waiting for them on the Blue Sands of Mars or will they be sent on a race into the past that has no end?