When Tony turns twelve and moves up to the next class of kart racing, he worries that he will never be able to compete against the older boys who have more experience.

"Suzy and Max are go-karting! Along the way, they learn about forces, energy, and materials. When their go-kart breaks down, will their science know-how help them win the race?"--Page [4] of cover.

Milo doesn't need friends. He's got his journal, which he fills with sketches of plants and animals. When Milo's mom makes him go to The Club, he keeps his distance from the others. That is, until the annual go-kart rally. Milo has used crutches to walk his whole life, but could he be the fastest for once? Milo wants to find out.

George, a boy who loves riding in a car with his father, enters a go-cart race and, in the process, learns to count to ten.

For Enzo, the Fourth of July means three things: fireworks, family, and car races! This year Zoë is finally old enough to compete in the Kids' Kart Challenge. But when one of the boys at the track says that girls aren't fast drivers, Zoë gets nervous and backs out of the race. Enzo knows it's up to him to help his family regain the confidence to compete on the big day.