When their parents' seedy old motel burns down on the same night they are visited by a strange man covered in skeleton tattoos, Cyrus, Antigone, and their brother Daniel are introduced to an ancient secret society, and discover that they have an important role in keeping it alive.

"The Knights of the Golden Circle was the largest and most dangerous clandestine organization in American history. It amassed billions in stolen gold and silver, all buried in hidden caches across the United States. Since 1865 treasure hunters have searched, but little of that immense wealth has ever been found. Now, one hundred and sixty years later, two factions of what remains of the Knights of the Golden Circle want that lost treasure--one to...

Sixteen-year-old Gwen, the newest and final member of the secret time-traveling Circle of Twelve, searches through history for the other time-travelers, aided by friend Lesley, James the ghost, Xemerius the gargoyle demon, and Gideon, the Diamond, whose fate seems bound with hers.

"One October morning, Laina gets the news that her brother was shot and killed by Boston cops. But what looks like a case of police brutality soon reveals something much stranger. Monsters are real. And they want everyone to know it. As creatures from myth and legend come out of the shadows, seeking safety through visibility, their emergence sets off a chain of seemingly unrelated events. Members of a local werewolf pack are threatened into silence....

"Time-traveling Librarian spy Irene has faced unimaginable challenges across a multitude of worlds, but to keep her friends safe, Irene will have to do what has never been attempted and cut through the tangled web of power at the heart of the Library. Irene is trying to learn the truth about Alberich-and the possibility that he is her father. When the Library orders her to kill him, and then Alberich himself offers to sign a truce, she has to discover...