Scenario: You're at the top of a mountain biking track. The track twists down the mountain and there are rock gardens around every bend. Can you make it to the bottom without falling off? Welcome to the Xtreme World of Billy Kool.

Thrill-packed new series from the author of the best-selling Toocool books! In the new Xtreme series, the adventure moves from the backyard to an extreme sports television program. Each book in the series features a different extreme sport. Readers will be hooked from the word GO!