“Taking a walk!” repeated Norman Wilder, the other young man, who was usually at Jane’s elbow at parties and sports affairs. “You mean—giving us the air!”

“Giving you the air? In what way?” Jane’s tone sounded severe, but her eyes were smiling into Norman’s, as if she were not at all sorry to see him.

“Forgot all about that tennis date we had, didn’t you?” demanded Max. “Is that a nice way to treat a couple of splendid fellows like ourselves?” He threw out his chest and pulled himself up to his full height, which was six feet one.

Mary Louise gasped and looked conscience-stricken.

“We did forget!” she exclaimed. “But we can play now just as well as not—at least, if you’ll take us home to get our shoes and rackets.”

“O.K.,” agreed Max. He turned to Norman. “Get into the rumble, old man. I crave to have Mary Louise beside me.”

The car started forward with its customary sudden leap, and Max settled back in his seat.

“We’ve got some great news for you, Mary Lou,” he announced immediately. “Big picnic on for this coming Saturday! Rounding up the whole crowd.”

Mary Louise was not impressed. Picnics seemed tame to her in comparison with the excitement of being a detective and hunting down thieves.

“Afraid I have an engagement,” she muttered. She and Jane had a special arrangement, by which every free hour of the day was pledged to the other, so that if either wanted to get out of an invitation, she could plead a previous date without actually telling a lie.