The gang are going camping, and are adamant that Mildred won't be joining them, but Mildred's uncle arranges a tent for her and joins her at the site. To complicate things further, a passing gang want to terrorise Graham and co. for kicks.
William's had a terrible time at school, unwittingly yet repeatedly getting into trouble. He promises the headmaster his behaviour will be exemplary for a whole week, but while he's hopeful things will go well, the others aren't convinced.
Keith is taken hostage by two criminals who mistake him for another boy. Only Mildred is a witness to the act, but will anyone believe her, and will they be able to help free Keith if they do?