When seventeen-year-old orphaned shapechanger Tessa Gray is kidnapped by the villainous Mortmain in his final bid for power, the London Institute rallies to save her, but is beset by danger and betrayal at every turn.

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.

"In the final installment in the Conspiracy of Us trilogy, Avery West and her friends must avert a deadly virus--and a murderous family set on ruling the world"--

Eleven-year-old orphan Tommy Learner's world in 1900 New York City collides with that of twelve-year-old, modern-day Jezebel Lemon in the basement of her apartment building, where together they must use the portals between worlds to thwart the Dead Gentleman, a legendary villain whose last unconquered world is the planet Earth.

"Heiress to the powerful secret society known as the Circle, Avery West crosses continents following a trail of clues she hopes will lead to Alexander the Great's Tomb--and the earth shattering secret it holds--before it's too late"--

"No one survived the party at the penthouse. Except Athan. Athanasios "Athan" Bakirtzis has made it far in life relying on his charm and good looks, even securing an invitation to a mysterious penthouse soiree for New York City's artsy elite. But when he sneaks off to the bathroom, he hears a slam, followed by a scream. Athan peers outside, only to be pushed back in by a boy his age. The boy gravely tells him not to open the door, then closes Athan...

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.

Grace Blakely believed that finding the truth about her mother's murder would finally give her peace, but now she knows that it is only the beginning of the secrets that will dominate her life--and make her a target on Embassy Row in Adria.

Sixteen-year-old Seph, a powerful wizard, gets caught up in a conflict between the Wizard Council, smaller groups with their own agendas, and a rogue politician--the Dragon--whose identity and whereabouts the others seek to know.

Horace F. Andrews, armed with a strange wooden box, and Chloe Burke, wearing a mysterious dragonfly pendant, become entangled in a secret and ancient society striving to protect powerful devices from the evil Riven.