In TUNNELS, boy archaeologist Will Burrows went in search of his missing father--and discovered a sinister subterranean world. Now, wandering the dark, hot bowels beneath the Colony with his best friend Chester and his brother Cal, Will stumbles across the Styx's dastardly plan to exterminate all Topsoilers by unleashing a lethal plague. Slowly he begins to piece together the plot. But how can Will save the Topsoilers from annihilation when his own life is at risk--and his killer stepsister is still at large?
DEEPER sent Will and Chester into FREEFALL-- tumbling through the subterranean Pore with the evil Rebecca twins in hot pursuit, both toting phials of the lethal Dominion virus. When, where, will they ever land?! Just when the drop seems infinite, the boys hit bottom, and find themselves in a realm of near-zero gravity atop a giant spongy fungus stuffed with artifacts from some lost golden age. But they are not alone. And above ground, black-clad Styx are sprouting like poison mushrooms, dead-set on spreading their plague!