Dewey Marriss is stuck in a crunch. He never guessed that the gas pumps would run dry the same week he promised to manage the family's bicycle-repair business. Suddenly everyone needs a bike. And nobody wants to wait. Meanwhile, the crunch has stranded Dewey's parents far up north. It's up to Dewey and his older sister, Lil, to look after their younger siblings and run the bike shop all on their own. To top things off, Dewey discovers that bike parts are missing from the shop. He's sure he knows who's responsible—or does he? Will exposing the thief only make more trouble for Dewey and his siblings?