Three weeks at the beautiful Merlin's Cove in Wales sounds like great fun to four friends, but someone else has got much more sinister plans for the beach—at night. Could it be the strange man Snubby meets on the first day, or is it to do with the ragamuffin he mistakes Snubby for?
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.