“Then I’ll let the house stand for the time being,” the man consented. “I don’t know who built this house, but I have an idea. Most of the work must have been done late in the day when I’m at the other end of the park feeding the deer.”

The Brownies plied Mr. Karwhite with questions, seeking to learn the name of the person he thought might have built the house.

“I can’t say,” the superintendent put them aside. “I intend to do a little investigating though.”

Long shadows were beginning to envelop the forest.

Fearful of being caught on the road after dark, the Brownies and their leader hurriedly said good-bye to Mr. Karwhite.

All the way to their homes, the girls could talk of nothing except what they would do in the new play room. Miss Gordon promised she would make a pair of dainty curtains for the window.

Several of the girls had extra dishes which they planned to bring.

“May we go tomorrow?” Connie pleaded. “The park officials may decide to take the little house down. We want to play in it every minute we can.”

Miss Gordon was very easy to persuade. “Yes, we’ll hike to the park again after school,” she decided. “It isn’t every Brownie troop that has its own tree house!”

“And a mystery with it!” added Jane pertly.