When Gilly McMahon sets out to build a billy-cart to enter a local racing derby she decides to do it without the help of her big brother, Cracker, and his friends, Trann and Bone. And keep the $1000 prize money. She is busy hunting for wood from a deserted shack in the dark of night to build her billy-cart when she overhears a conversation that makes her realize she needs her brother's help after all.