The boys are hired to find a missing dog, but then discover the dogs owner has spotted a coughing dragon coming up the beach in front of his house. Investigating that, the boys discover hidden caves and a long-abandoned underground railway, before coming face to face with the dragon itself. This is preposterous but such good fun that you can forgive the plot-holes (you’d use a dragon, for that purpose?) and the humorous interplay between the boys is superb (the dialogue here, in fact, is probably some of the best in the series). With a limited cast and well realised - and used -locations, this is real treat. Highly recommended.
