"Maybe it was made for the lock of the door to the room father occupied," suggested Tom.
"It's like the old key," returned Dick, comparing the two. "That rascal, whoever he is, must have had the key made for the sole purpose of getting into this room!"
"But for what reason?" questioned Sam.
"To get at dad's private papers," answered his big brother. "Boys, if we catch that man maybe we'll be able to find out what has become of father!"
CHAPTER XIV
DICK MAKES A DISCOVERY
While the boys were discussing the situation one of the night clerks of the hotel arrived, having been summoned by the hallman. He listened with interest to what the lads had to tell.
"I'll set the house detective on this," he said. "We can't allow anybody to prowl around, trying to use false keys."
"We want to catch that man ourselves," said Dick. "We are going to set a watch for him. No more sleep for us to-night."
"I don't blame you," returned the clerk. "If you spot him, call up the office and we'll give you all the help you want."