The Picts and the Martyrs - Arthur Ransome

The Ds can't wait to go and stay with Nancy and Peggy in the Lake District during the summer holidays. But when the Amazons' dreadful Great Aunt invites herself to stay too, the summer is threatened with dullness. Staying indoors and reading poetry is not what anyone had in mind. To save the Ds from total boredom, the Amazons arrange for their friends to stay in a tumble-down hut in the woods. And as long as no one discovers they're there they can sail all summer long... In the Backstory you can learn how to make a campfire!