The Firestone — Ann Tufariello

KIDNAPPED! Thirteen year-old Jack Barton is awakened by a knock at his front door. The police are searching for a missing kid named Bradley and think Jack might know something. When Jack's bed-ridden brother offers details about Bradley's disappearance, Jack is baffled. Following cryptic clues, Jack boards a mysterious roller coaster that blasts him to the fourth dimensional planet of Jupiter. Soon Jack discovers that the Dark Forces are kidnapping kids and making them go on a deadly scavenger hunt. With Jupiter crumbling under the weight of so much negative energy, time is running out for Jack and the others. To defeat the Dark Forces and find a way back home, Jack must solve the riddle of the ancient Firestone.