The Secret Seven short story titled "The Secret of the Old Mill". It followed an earlier short story, "At Seaside Cottage", which introduced the leading characters Peter and Janet prior to the formation of the society. There followed a further five short stories and fifteen full-length books. The Secret Seven appeared in seven short stories by Blyton, including a mini-novella explaining how the society was formed. These were left uncollected until 1997, when all but "At Seaside Cottage" were published in a single volume by Hodder Children's Books under the title of "Secret Seven: Short Story Collection". Scamper – Janet and Peter's pet
Enid Blyton Brothers. Other books with a maritime theme include "The Secret of Cliff Castle" and "Smuggler Ben", both attributed to Mary Pollock in 1943; "The Island of Adventure", the first in the Adventure series of eight novels from 1944 onwards; and various novels of the Famous Five series such as "Five on a Treasure Island" (1942), "Five on Kirrin Island Again" (1947) and "Five Go Down to the Sea" (1953). Capitalising on her success, with a loyal and ever-growing readership, Blyton produced a new edition of many of her series such as the Famous Five, the Five Find-Outers and St. Clare's