Children's literature R. M. Ballantyne and G. A. Henty specializing in the production of adventure fiction for boys. This inspired writers who normally catered to adult audiences to write for children, and an example is Robert Louis Stevenson's (1850–94) classic pirate story "Treasure Island" (1883). In the years after the First World War, writers such as Arthur Ransome (1884–1967) developed the adventure genre by setting the adventure in Britain rather than distant countries. Ransome began publishing in 1930 his Swallows and Amazons series of children's books about the school-holiday adventures of children, mostly in the English Lake District and the Norfolk Broads.
Swallows and Amazons series skating ability. The Callums are the link to a different location and another set of characters. Following their appearance in "Winter Holiday", they appear in two following books set in the Norfolk Broads, where they meet the Coot Club: Tom Dudgeon; the twins, Port and Starboard; and Bill, Joe & Pete the three sons of boatbuilders: the "Death and Glories". With a couple of exceptions, the exact ages of the characters are never established. In the first book they run from Roger, at 7 years old, to about 12 to 14 (John and Nancy). All characters age as the series