A man goes to the aid of woman pursued by assassins and discovers an alternative City of London, a subterranean, medieval world populated by "people who fell through the cracks" from the real city above. A fantasy tale, replete with demons and wizards. By the author of The Sandman.

Twelve-year-old Gregor returns to the world beneath New York City, where he joins forces with Princess Luxa and Ripred the rat to defend the Underlanders and the Nibblers from the army led by the adolescent rat king, the Bane.

14-year-old Will Burrows has little in common with his strange, dysfunctional family. In fact, the only bond he shares with his eccentric father is a passion for archaeological excavation. So when his dad mysteriously vanishes, Will is compelled to dig up the truth behind his disappearance. He unearths the unbelievable: a subterranean society that time forgot. "The Colony" has existed unchanged for a century, but it's no benign time capsule of a bygone...

When police find two odd skeletons locked in a bony embrace deep in the mud off the Manhattan shoreline, Natural History curator Margo Green is called in to aid in the investigation.