Using her keen observation skills, 11-year-old Harriet M. Welsch writes down in her notebook what she considers the truth about everyone in and around her New York City neighborhood. When she loses track of her notebook, it ends up in the wrong hands, and before she can stop them, her friends read the sometimes awful things she's observed and written about each of them.

In the trilogy opener, twelve-year-old Lincoln Baker finds himself in a world of trouble! First, Linc’s seemingly harmless prank on a school field trip ends in expulsion and a lawsuit. Then two mysterious figures from a secret government agency called Pandora show up at Linc’s house with a proposition for him.

Thirteen-year-old Quest (Q) isn't sure he's ready for a new family. Q, along with new stepsister Angela, will take a year off from school and travel with the band. For now, home will be a luxury motor coach and homework will be a Web site diary of their travels. Perfect-Q can practice his magic tricks and Angela can read her spy novels. What can go wrong?

CHERUB agents wear skate tees and hemp, and look like regular kids. But they're not. They are trained professionals who are sent out on missions to spy on terrorists and international drug dealers. James is the latest CHERUB recruit. He and his sister were recently orphaned, and James has been in a lot of trouble. But he is brilliant in math. And CHERUB needs him.