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.

Emotionally crippled by his obsessive-compulsive disorder, teenager Matthew Corbin rarely leaves his room on a cul-de-sac in London, and he passes the day observing and writing down his neighbors' doings from his window--but when a toddler staying next door disappears Matt is the key to solving a mystery and possibly saving a child's life...if he can manage to expose himself, and his secret guilt to the outside world.

In 1766, a boy, Billy Marvel, is shipwrecked, rescued, and goes on to found a brilliant family of actors that flourishes in London until 1900--and nearly a century later, Joseph Jervis, runs away from home, seeking refuge with his uncle in London, and is captivated by the Marvel house, with its portraits and ghostly presences.