Sixteen-year-old half-alien Sydney Chambers leaves Earth to seek his long-missing father, and unearths a devastating, centuries-old secret about humanity.

When Michael Malone saves a dog, he discovers that he has paranormal abilities, which bring him to the attention of a secret organization, UNICORNE--but he plans to use the ability to find out what happened to his father, who mysteriously vanished three years earlier, and save his new friend, Freya.

In 1889 Evaline Stoker, Mina Holmes, and their time traveler friend, Dylan, are asked by the Princess of Wales to find out what happened to Robby Ashton, who may have drowned--but the reappearance of vampires in the heart of London threatens to become a more urgent problem.

Publisher Annotation: When her best friend vanishes without so much as a good-bye, eighteen-year-old Piper Sail takes on the role of amateur sleuth in an attempt to solve the mystery of Lydia's disappearance. Given that Piper?s tendency has always been to butt heads with high-society?s expectations of her, it?s no surprise that she doesn?t give a second thought to searching for answers to Lydia?s abduction from their privileged neighborhood. As Piper...

Twelve-year-old Mila travels with her father to upstate New York to visit friends and family, who may lead them to clues to the whereabouts of her father's best friend, who has gone missing.

Elliot must help Princess Ko find her missing family.

In Cambridge, England, Madeleine Tully is still working to gather the Royal Family, and get them back to their parallel world--but in Cello, Elliot Baranski is being held captive, the Hostiles are working against the Royal Family, and the World Severance Unit is trying to stop all contact between Cello and the World for good.