The last of his friends who still need training wheels for his bicycle, Franklin becomes increasingly discouraged as he continues to fall down, but then he gets an idea from Porcupine that will help him.
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.
Houndsley likes canoeing and his friend Catina likes bicycling, but each has to help the other learn to enjoy these activities in order to do them together.
Wanting to pedal around all by himself after learning how to ride his new bicycle, Henry is disappointed when his mother limits his first solo trip to "just around the block, " until he encounters other bike riders, a construction site, a fancy hot-dog stand, and other vehicles.