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.

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?