Eleven-year-old Gregor and his younger sister, Boots, return to the Underworld 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 underworld.

June and Day have sacrificed so much for the people of the Republic -- and each other -- and now their country is on the brink of a new existence. June is back in the good graces of the Republic, working within the government's elite circles as Princeps-Elect, while Day has been assigned a high-level military position. But neither could have predicted the circumstances that will reunite them: just when a peace treaty is imminent, a plague outbreak...

A deadly, flu-like epidemic and a plague of flesh-eating creatures threaten the lives of the children at Perdido Beach while Sam, Astrid, Caine, and Diana each struggle with doubts and uncertainties.

"Princess Imogen of Goslind has lived a sheltered life for three years at the boarded-up castle--she and the rest of its inhabitants safe from the bloody mori roja plague that's ravaged the kingdom. But Princess Imogen has a secret, and as King Stuart descends further into madness, it's at great risk of being revealed. Rations dwindle each day, and unhappy murmurings threaten to crack the facade of the years-long charade being played within the castle...

In a dark future, when North America has split into two warring nations, fifteen-year-old Day -- a famous criminal, and prodigy June -- the brilliant soldier hired to capture him, discover that they have a common enemy.

Thirteen-year-old Lizzie and her secret friend Noah, who is hiding in her house, plan to rescue Noah's father from the quarantined Chinatown, and save everyone they love from contracting the plague that is spreading in 1900 San Francisco.

"In a world where people are implanted with technology to recode their DNA, gene-hacking genius Cat must decrypt her late father's message concealing a vaccine to a horrifying plague"--

In fourteenth-century Norway, the plague has destroyed Rype's entire village, and as the sole survivor, she embarks on a sweeping adventure across Europe with the son of an English ship captain and a band of troubadours in search of a brighter future and a new home.

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...

Bryn, Ari, and their dragon Lilja discover a sick baby gyrpuff and join the rest of the Seekers in trying to determine if a dreadful plague has returned--and if human forces brought it back.