Having expanded his summer lawn mowing job into an ever-growing business conglomerate, a twelve-year-old boy gets involved in high finance thanks to his hippie stockbroker, takes on sponsorship of a boxer, and becomes a media sensation.

Sixth-graders Mac and Vince operate a business charging schoolmates for protection from bullies and for help to negotiate conflicts peacefully, with amazing challenges and results.

Twins Bick and Beck Kidd and their family of professional treasure hunters race against mercenaries, rival treasure hunters, and a lumber baron through the jungles and mountains of Peru in search of Paititi, the legendary lost Inca city of gold, in hope of conserving the archaeological treasure and preventing deforestation of the rain forest.

The oldest Marriss brother, fourteen-year-old Dewey, attempts to be the "embodiment of responsibility" as he juggles the management of the family's bicycle repair business while sharing the household and farm duties with his siblings after a sudden energy crisis strands their parents far from home.

Discovering that a treasure has been bequeathed to her family, Colophon Letterford explores clues hidden in antique paintings, secret passages, and a locked mausoleum to discover a link between her family's legacy and William Shakespeare.

Henry Reed keeps a journal of his summer activities which include setting up a research firm and embarking on a series of usually profitable projects with the aid of his ally and neighbor Midge.

Explains how to make a profit at a small business venture, such as a bake sale, focusing on how to determine the unit cost of an item in order that a profit can be made.

Six-graders Mac and Vince, who operate an advice and assistance service for fellow students, face new dangers when a strict administrator is hired to clean up the school and a strange and dangerous girl asks for their help to have a teacher fired.

After putting together some of the best parties of the summer, the girls of RSVP are hired to plan an important wedding but a hurricane threatens to ruin everything.

Mayhem ensues in their sleepy California beach town when three best friends, motivated by unlimited snacks, no parents, and earning money for an epic seventh-grade party, find an old copy of "The Babysitters Club" and decide to start their own babysittingbusiness.