“Who did, then?”

“That is what we must find out,” announced Laura, decidedly.

“How ridiculous you talk!” exclaimed Jess. “We can’t find out.”

“I believe one can explain almost any mystery if one only puts mind enough to it.”

“That’s all right, Miss Sherlock Holmes. Put your great mind to it. Be the greatest female detective of the age!” scoffed Jess. “You’re going to do wonders, aren’t you? How about getting a big present from Colonel Swayne for our new athletic field, too? Say! you’ve been promising a whole lot that you’ll never perform, Laura.”

“I’ve been promising to try, my dear. And I can still try,” laughed her friend.

But Laura was very much in earnest regarding three things just at this time. First, was the discovery of how the fire started in the schoolhouse; second was the mystery of the person who had bound her in the haunted house in Robinson’s Woods; third was the interesting of the wealthy Colonel Swayne in girls’ athletics.

This last would seem to be the hardest of all, for Colonel Swayne had, on several occasions of late, complained to the school board that the athletic field and bathing place adjoining his estate was a nuisance. He complained of the shrill voices of the girls at play; but how did he expect young folk to disport themselves and have a good time without shouting and laughter?

The week following the boat race two eagerly contested doubles were going on the courts next to Colonel Swayne’s line at the same time. The girls were making a great deal of noise, but they were doing so innocently. Once a serving man had climbed a stepladder and, looking over the hedge and fence, announced that his master “would be pleased if the young ladies went to the further side of the field to play.”

“How ridiculous!” exclaimed Jess Morse, who happened to be one of the contestants. “Does he think that we can pick up the courts and move them about at will?”