Thirteen-year-old Q and fifteen-year-old Angela expect their lives to become complicated when his mother and her father, wildly popular musicians, marry, but not that they will face spies and terrorists in Philadelphia, Pennsylvania.

When Ludlow Fitch runs away from his thieving parents in the City, he meets up with the mysterious Joe Zabbidou, who calls himself a secret pawnbroker, and who takes Ludlow as an apprentice to record the confessions of the townspeople of Pagus Parvus, where resentments are many and trust is scarce.

When Ted and Kat's cousin Salim disappears from the London Eye ferris wheel, the two siblings must work together--Ted with his brain that is "wired differently" and impatient Kat--to try to solve the mystery of what happened to Salim.

Fourteen-year-old Anthony "Antsy" Bonano learns about life, death, and a lot more when he tries to help a friend with a terminal illness feel hopeful about the future.

When thirteen-year-olds Jonah and Chip, who are both adopted, learn they were discovered on a plane that appeared out of nowhere, full of babies with no adults on board, they realize that they have uncovered a mystery involving time travel and two opposing forces, each trying to repair the fabric of time.