It's Wimbledon tennis fortnight and there's much excitement as King Charles and Queen Camilla receive a special invite from Princess Kate - to watch her and Prince William play a charity match against Sir Andy Murray and Heather Watson on Centre Court. What a treat! Off go Charles and Camilla to brush up on their own tennis skills with their faithful aide, Jenkins, on hand to whip up some royal tennis whites. Meanwhile, beneath Marble Arch Station, daring mouse Elly Archer also has her sights set on a visit to Wimbledon and is soon hatching a plan to sneak over there with her friends Billy and Bunty Bell to watch the Ladies' Final - without the grown-ups! What could possibly go wrong? And Harry the Hero Rat has a secret plan too... he's heard that juicy red strawberries are eaten there by the tonne, a perfect opportunity to gather up the leftovers and make strawberry jam for all the mice on the London Underground! But things go messily wrong when Kate and William discover Harry's stash of strawberries... and somehow, Charles and Camilla find themselves serving for the match on Centre Court. Thank heavens they practiced! The question is, will they win...?!