looked startled. âWhyâahâyes,â he answered. âWhatâs on your mind, boys?â
They told the elderly man about finding his assistant changing the back-door lock on the Hardy house without authorization.
Mr. Whittaker looked concerned and went immediately to his desk.
âHereâs the order,â he said, holding up a pad.
âMay I see it?â Frank asked.
Whittaker handed him the pad. Written on it was âHardyâback-door lockâ and under it âMrs. Eccles.â Frank suggested that the locksmith call Mrs. Eccles to see if she had left an order to have her lock changed.
Mr. Whittaker apprehensively made the call. His expression became more grave as he spoke with Mrs. Eccles. When he finally hung up, he said in a weary voice:
âSheâs very upset. She never ordered any lock-work either, but her lock was changed while she was out shopping. And when she returned, two hundred dollars was missing from her desk drawer!â
Mr. Whittaker paced up and down, completely baffled. âI canât understand it. Batton came with excellent references.â
âHow long has he worked here?â Frank asked.
âI hired him just about a week ago. Needed help badly andââ The manâs voice trailed off.
âWhere does he live?â Joe asked.
âIn a boardinghouse on Dover Street. Iâll call him.â
The woman who answered the phone said Batton was out and had left word he would not be back until late that evening.
The locksmith looked strained and tired, so the boys left. âWeâll call you if we hear anything, Mr. Whittaker,â Frank said. âIâm sure thereâs an explanation.â
âYes. My employee is a thief,â Mr. Whittaker said sadly and locked the shop door. âThanks, boys.â
Both Frank and Joe felt uneasy as they drove home, and were more suspicious of Batton than before. One mistake might happen, but hardly two of the same kind. And what about the money?
âWhat I canât understand,â said Joe, âis this. If Batton is a thief, why did he pick our house? The Eccles are pretty wealthy, but weâre not.â
âItâs a puzzler, all right,â Frank agreed. âIâm still inclined to think that Batton never intended to put a new lock on our door; he just planned to get into the house. But why? In any event, he covered himself nicely with that false order on the phone pad.â
When the boys reached home they learned that Mr. Hardy would not return until the next morning. Mrs. Hardy and her sons sat down to dinner and during the meal Frank and Joe told her everything that had happened that day.
âLooks as if you have two or three mysteries on your hands,â their mother said with a smile when they had finished their report. âWhich one will you work on first?â
âAll of them at once,â Joe replied with a grin.
âSometime tomorrow,â Frank said, âI want to dive for that lost key. I meant to ask Mr. Whittaker if he knew anything about the Mead place, but didnât have the heart to. He was so upset.â
âYou have another big day ahead of you,â Mrs. Hardy said. âBetter go to bed early.â
Frank and Joe followed her advice, and their mother also retired at ten oâclock. It was past midnight that she was awakened by the doorbell.
She called out to the boys, who had heard it too and had come from their room. âIâll see who it is,â Joe offered, putting on his robe and bedroom slippers.
As he spoke, the bell rang again. This time the caller kept a finger on the button. Frank and Joe hurried downstairs.
Mrs. Hardy was right behind them and warned the boys to be cautious. Before opening the door, Frank snapped on the porch light and looked out the glass panel.
Joe peered over his shoulder. âDo you know her?â he asked his brother, pointing to the visitor.
Frank shook his