A Peter Duck story is a story made-up by Titty Walker, as described in Swallowdale. On Arthur Ransome Wiki, the term Peter Duck story is used to describe the "stories within stories" status of some novels in the Swallows and Amazons series especially Peter Duck and Missee Lee as well as Great Northern? although the latter is not universally accepted as such. Another term for this device of a story within a story is metafiction.