Sixteen-year-old Gwyneth discovers that she, rather than her well-prepared cousin, carries a time-travel gene, and soon she is journeying with Gideon, who shares the gift, through historical London trying to discover whom they can trust.

Foundling Fever Crumb has been raised as an engineer although females in the future London, England, are not believed capable of rational thought, but at age fourteen she leaves her sheltered world and begins to learn startling truths about her past while facing danger in the present.

Two teenaged aspiring journalists who are dating solve a mystery at the 2012 Olympic Games, while one simultaneously competes for a gold medal in swimming.

In their continuing adventures, magician's apprentice Nathaniel, now fourteen years old, and the djinni Bartimaeus travel to Prague to locate the source of a golem's power before it destroys London.

In 2050, while visiting Pastworld, a Victorian London theme park, teenaged Caleb meets seventeen-year-old Eve, a Pastworld inhabitant who has no knowledge of the modern world, and both become pawns in a murderer's diabolical plan that reveals disturbing truths about the teenagers' origins.

While in London visiting her mother, fifteen-year-old Miranda guiltily enjoys the company of a British boy while wondering why Dex is out of touch, but she returns home to find her friendships, love life, family, and math team are all in turmoil.

Fifteen-year-old Octavia Clairbrook-Cleeve, the daughter of a famous television actress and a respected film and theater director, feels out of place amidst the glamour, wealth, and high society that surround her, and when she begins dating a rich and handsome older boy, her doubts about this lifestyle become impossible to ignore.

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.