It's half term and Millie persuades both sides of the family to go on a joint camping holiday. She's worried that sparks will fly among the adults - but they get on fine, and instead, it's the kids who fall out. Trying to keep the two factions happy means she's Millie Inbetween yet again. When her plan for a woodland trek fails to unite them, she decides to stage being lost in the woods, so they'll work together to find her. It's the perfect plan - until she realises she really is lost!