To celebrate her birthday, George is taking Nancy and Bess on a bike tour around Mystic Lake, but when their tour guide disappears and unknown adversaries steal their supplies and slash their tires, Nancy begins looking for clues.

Although his scheme to get out of eating his mother's health food nearly ruins his plan to save money for a bike, Jason finally finds success in an unexpected way.

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.

While Bryce and Jeff go on a two-hundred-mile bicycle trip, Ashley tries to find out what happened to Jeff's sports memorabilia, which have mysteriously disappeared.

Twelve-year-old Marcel loves riding his bicycle, and dreams of competing in the Tour de France, but it is 1942 and German soldiers are everywhere, stopping him as he delivers bread from his parents' bakery around Aucoin--then one day he discovers that it is not just bread he is delivering, and suddenly he finds himself in position of dangerous secrets about his parents and his new friend from Paris, Delphine.

Jack is learning to ride a bike. The bike wobbles. The bike tips. Jack tries again and again. Dad tells him, "You can do it!" Will Jack ever become a bike rider?

Tom enjoys the thrill of riding his brand new bicycle, and then shares it with a friend.

A duck decides to ride a bike and soon influences all the other animals on the farm to ride bikes too.

When Josh is asked to try out for the school BMX team, he is not sure that he can do any of the tricks--can practice make perfect in time for the Metro Games?

"Bear is an extraordinary, genius bear, who can do anything except ride a bike. Can Bear figure out how to get on two wheels?"--