The detective rubbed his neck, and looked at the two boys narrowly.
"Germans in this house?" he said at length.
"They had a meeting here last night," said Bob.
"How do you know?"
"We followed them out here. Look at this too," and he handed over the list of buildings to be destroyed that they had found in the old house.
The detective snatched the paper out of his hand and scanned it eagerly.
"Where did you get this?" he demanded.
"We found it upstairs," said Bob.
"Humph," ejaculated the detective and thrust it into his pocket.
"Weren't you trailing these Germans too?" inquired Bob.