Roger and Diana are going on holiday with their mother in a new caravan, the idea being to drive from place to place and stop wherever they want for the night. Sounds grand! It's a pity their father can't come with them, as he has to go to America again, but Miss Pepper will come instead. That way she and Mrs Lynton can take turns driving the car.
Off they set, and it's probably a good thing Snubby isn't cooped up with them in the car. He and Loony would drive everyone mad! Snubby is staying with Aunt Pat, much to his dismay. Still, the readers know full well that a Barney Mystery isn't going to work without the full team, so it's just a matter of time before Roger and Diana are going to be reunited with Barney, Miranda, Snubby, and Loony. And the question isn't so much when such a reunion will occur, but how .