Identical twins Amelia and Imogen are trying to get into Wimbledon. The twins' brother Riley thinks that being ball girls could be their golden ticket into Wimbledon and meeting Johanna Konta for some fitness training, they think it could be too. But once they get to ball crew boot camp will they realise it's harder than they first thought? And will they finally learn to take direction by going on the set of The Worst Witch in time for their Wimbledon try out?