Tom and the Pterosaur is an adventure story, likely involving time travel or a hidden valley where dinosaurs still exist. The protagonist, Tom, encounters a Pterosaur, a large, winged prehistoric reptile. The plot would involve a fast-paced adventure where Tom must either help the Pterosaur, escape its pursuit, or ensure it is returned to its rightful time/place. The story blends excitement with a fascination for paleontology.