It's the first day of Pony Camp at Merryfield Hall Riding School. Amber has been looking forward to it for months! But that evening, she spots a pony in a neighbouring field, being bullied by a group of boys. Told that his owner no longer wants Oscar, and that in the morning he will be taken away and destroyed, Amber is horrified, and hatches a rescue plan. But can she keep him hidden long enough to find the owner and convince him to save Oscar?