Kate and Ruby live in the High Country in Victoria. They're both daring, quick-thinking and prepared to break the rules, and they're both brilliant horse riders—they'd probably be great friends. But they live in different times, more than 140 years apart. While galloping through the mountains, Kate rides headlong into a thrilling experience that transports her from 1878 to the future, where she meets Ruby. Kate and Ruby return to 1878, where Kate is secretly taking supplies to her brother Ned and the rest of the Kelly Gang, who are in hiding from the police. Together the girls work to confuse the police and keep the gang from being found and arrested. But the looming disaster makes things less clear-cut for Ruby. They're about the have the ride of their lives!