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
The Secret Series (Enid Blyton) mountainside which leads to an underground river, which eventually flows into a secret forest which is entirely inaccessible from outside, owing to being entirely surrounded by immensely tall cliffs and mountains which are completely impassable. It turns out the robbers live here, and only they know the secret tunnel leading into the forest – which is why no-one has been able to detect them for years. Unfortunately the children have now fallen into the clutches of the robbers, who are totally ruthless, and go through many tense adventures in their efforts to escape and get back outside the mountain again.