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.

Inexplicable events start to occur when sixteen-year-old twins Tennyson and Brontë befriend a troubled and misunderstood outcast, aptly nicknamed Bruiser, and his little brother, Cody.

"From the moment that Annie was born, she and her older brother, Jamie, were inseparable. Facing the challenges of growing up different in suburban America, they created their own space in the woods behind their house: a fantasy world of their own making, where no one else could find them. But as they grew, Jamie grew dark and distant. He found new friends, a girlfriend, and a life away from Annie and their shared world. By the time Annie was in eighth...

Thirteen-year-old Bonnie has a feeling of foreboding on the very day that her six-year-old brother Matt and their dog Pookie are abducted, and she becomes involved in a major search effort as well as a frightening adventure. Matt is missing. Bonnie's brother left his classroom to use the bathroom --and disappeared. A police dog traces his scent to the curb, where he apparently got into a vehicle. But why would Matt go anywhere with a stranger? Overwhelmed...

Freed from slavery, Mariah and her young brother Zeke join Sherman's march through Georgia, where Mariah meets a free black named Caleb and dares to imagine the possibility of true love, but hope can come at a cost.

"Sam is dreading senior ski weekend and having to watch after her brother and his best friend, Gavin, to make sure they don't do anything stupid. Again. Gavin may be gorgeous, but he and Sam have never gotten along. Now they're crammed into an SUV with three other classmates and Gavin's dog, heading on a road trip that can't go by fast enough. Then their SUV crashes into a snowbank, and Sam and her friends find themselves stranded in the mountains...

Hanne and her siblings flee Norway after her "gift" causes her to commit murder, and on the American frontier Owen, a cowboy, leads them toward their uncle who may help them learn control.

Detective Tom Moon and his multi-talented team face off against an international crime ring looking to seize control of America's most vibrant city, Miami. The city of Miami is Detective Tom Moon's back yard. He's always kept it local, attending University of Miami on a football scholarship, and, as a Miami PD officer, protecting the city's most vulnerable. Now, as the new leader of an FBI task force called "Operation Guardian," it's his mission to...

Anxious eighteen-year-old Tally and her twin Max set off on a whirlwind high school exchange trip to Israel where she grapples with her Jewish identity, mental health, and sexuality.

Sixteen-year-old Mackie Doyle knows that he replaced a human child when he was just an infant, and when a friend's sister disappears he goes against his family's and town's deliberate denial of the problem to confront the beings that dwell under the town, tampering with human lives.