When Ada travels to the seaside resort of Brighton on holiday, she is very excited to meet leading followers of fashion Lady Vivienne Dashwood and her rival, the fashionable shepherd, Beau Peeps. They are there preparing for World Frock Night - a lavish ball where everyone dresses up in their finest costumes to compete for the grand prize. Ada has been given money by her father to buy a spectacular outfit for the ball, and she's excited to be in with a chance of winning the prize. But, as usual, nothing goes to plan, and becoming the belle of the ball will prove to be Ada's biggest challenge yet