Down by the brink of the lake was a boat-house that belonged to the school. It was kept carefully locked, and Miss Todd had the key. Since she had taken over the school she had allowed no one to use the boat--a grievance at which the girls sometimes grumbled. There was a small landing-stage at the edge of the water, and only six feet away from this was a sort of island formed of some willow-stumps and a little soil. It was a tiny place, hardly worthy to be called an island, and yet for Diana it held an immense attraction. She wanted to get on to it. She went down one day with Wendy, Peggy, and Vi, and they took the plank which had been used for a see-saw, fixed it as a bridge from the landing-stage to a willow-stump, and then walked across and took possession. Their new property was only about as large as a good-sized dining-table, but they were immensely pleased with it.