Charlie's mum is upset when someone takes two of the special biscuits she was saving for her school reunion. Incorrectly blamed for taking them, Charlie sets about trying to find out who the real culprit is.

When Charlie breaks the microwave, he needs a plan to make money for repairs, and thinks car washing may be the perfect solution. He just needs to work out a way to make cars dirty first.

Charlie, Ben and Alison gatecrash a party. But things start to get out of hand when they have to pretend Ben is a visiting Czech gymnast Wenclas - the party guest of honour. What will happen when the real Wenclas arrives in Scarborough?