Eleven-year-old Gregor and his younger sister, Boots, return to the Underland beneath New York City to find the cure for a terrible plague that threatens the life of their mother, as well as the lives of the people, bats, and rats who populate the Underland.

"As the new chieftain of the Crows, Fie knows better than to expect a royal to keep his word. Still she's hopeful that Prince Jasimir will fulfill his oath to protect her fellow Crows. But then black smoke fills the sky, signaling the death of King Surimir and the beginning of Queen Rhusana's merciless bid for the throne..."--

Told in two voices, seventeen-year-old alchemy student Nedra turns to dark magic when a deadly plague sweeps through her homeland leaving her new friend, Grey, to pull her from the darkness. Nedra Brysstain left the rural, northern territories of Lunar Island to attend the prestigious Yugen Academy with only one goal in mind: learn the trade of medicinal alchemy. She's a scholarship student matriculating with the children of Lunar Island's wealthiest...

When a mysterious plague threatens to wipe out the inhabitants of Eelong, fifteen-year-old Bobby Pendragon must decide whether to risk getting the antidote and, thereby, endangering himself, his friends, and the future of every other being in Halla.