The lieutenant affected not to hear the remark.

"Some one is getting into the building," Harvey whispered. Mattison stepped lightly across the hall and, bending down, listened at the keyhole. He returned with an excited gesture.

"Don't you hear it?" he asked.

"No," said Mallory. "I don't hear anything."

"Are you deaf, man?"

"No, but I think I know when to hear."

It occurred to Harvey that Jim had done his work well. But then, Jim's orders, however brief, were always understood. Harvey motioned the others to be silent, and tiptoed across the floor. He listened as Mattison had done, then pa.s.sed on to the President's door. Cautiously he drew a bunch of keys from his pocket, and feeling for the right one he slipped it into the lock, threw open the door, and darted into the office. Mattison and the detective followed, stumbling over chairs, and colliding with the door to the inner office, which had closed after Harvey. In the dim light they could see two figures struggling in the pa.s.sage by the vault. While Mattison sprang forward, Mallory quickly lighted the gas.

The light showed that Harvey had crowded the fellow up against the vault door. The newcomer was a medium-sized man, rough-faced, and poorly clad.

On the floor was a small leather grip, which evidently had been kicked over in the scuffle, for part of a burglar's kit was scattered about the pa.s.sage.

Mallory jerked the man's wrists together, slipped on the handcuffs, and led him out into the hall. In a moment the detective returned.

"I left him with the boys, for the present. Case of common safe-cracking."

"Do you think so?" said Harvey, adjusting his cuffs, and moving the strange tools with his foot. "If he wanted money, I should think he would have tackled the vault downstairs."

Mallory stooped, and replaced the kit in the bag. Suddenly he said,--

"Raise your foot, Mr. West."

Harvey did so, and the detective arose with a dirty paper in his hand. He looked it over, and handed it to the others. It was a rough pencil sketch of the station building, showing the alley, the window, the Treasurer's office, and the vault.

"What do you think of it?" asked Mallory.

Harvey turned it over. A second glance showed it to be the front of an envelope, for part of an end flap remained. The upper left-hand corner had been torn off, evidently to remove the return card, but so hastily that a part of the card remained. Straightening it out, and holding it up to the light, Harvey read:--

----esleigh, ----ster, Illinois.

Mallory looked over his shoulder, and exclaimed:--

"That's easy. Hotel Blakesleigh, Manchester, Illinois."

"How does that help you?" asked Mattison.

Harvey lowered the paper.

"Don't you see," he replied. "There are two good hotels here, the Illinois and the Blakesleigh. McNally is not at the Illinois." He turned to the detective. "You'd better let the fellow go, Mallory."

"Why?"

"Because it is the easiest way to handle it. Keep the tools, though."

"But I don't understand, Mr. West."

"Well, there is no use in discussing it. We won't prefer charges."

"But the man was caught in the act."

"He didn't get any thing, poor devil. No; we're after bigger game than this. We have enough for evidence. And don't sweat him."

"This is too deep for me, Mr. West. Surely there's no harm in questioning him, now that I've got him."

"Can't help it, Mallory. When that man reports to his employer, I want him to say that we suspect nothing beyond his attempt to crack the safe."

The detective turned away with a frown.

"I suppose you know your business, Mr. West."

Harvey and Mattison followed him to the hall, closing the door after them.

They said good night, and left the building.

"See here, West," said Mattison, when they were fairly around the corner, "wasn't that a little hasty? It wouldn't hurt to keep the man out of the way."

"No, I don't agree with you. What McNally has done so far will be upheld by his judge. And another thing, Mattison; just at present, it isn't to our interest to get an investigation under way. We're going to do the same thing ourselves."

Slowly and cautiously they slipped around the next square, and, by returning through the alley, brought up in the shadow of a building, across the street from the train shed. Here they waited to reconnoitre.

The night was clear, and the arc-lamp at the corner threw an intermittent glare down the street. As they looked, a long shadow appeared on the sidewalk. Mattison gripped Harvey's arm, and drew him back into the alley.

They crouched behind a pile of boxes.

"It's like stealing apples," whispered Harvey. "When the old man gets after you with a stick."

"Ssh!"

The footsteps sounded loud on the stone walk. Then a helmeted figure pa.s.sed the alley, and went on its way.

Waiting until the sound died in the distance, the two stepped to the walk, looked hastily toward each corner, and ran across the street. Once in the station alley, they paused again.

"Look!" said Harvey, pointing; "he left the ladder."

Sure enough, a light ladder reached from the ground nearly to a second-story window, which stood open.

"Well, here we are," Mattison whispered. "How do you feel?"

"First-cla.s.s. Better let me go,--I know the combination."

Mattison stood at the foot of the ladder, and steadied it while Harvey stealthily climbed to the window. Drawing himself into the pa.s.sage, the receiver set to work on the vault lock. He turned the k.n.o.b very slowly, guarding against the slightest noise, but the faint light that came through the window was not enough to bring out the numbers. Harvey leaned back and considered. The scratching of a match would almost surely be heard by the detectives. He leaned out the window, and beckoned. Mattison came creeping up, and Harvey explained in a few whispered sentences. "Go back and look up the street," he concluded. "We've got to light it outside the building."

While Mattison was gone, Harvey felt his way through the Treasurer's office and paused to listen; then he drew up a chair which stood near the door, and climbing up, slipped off his coat and hung it over the half-open transom. Then he closed the transom, and the room was practically light proof. With the same caution he reached the floor, and tiptoed back to the window, where he found Mattison waiting on the ladder.

"All right," whispered the Superintendent. "Are you ready?"

"Yes."