"That's a fact!" cried Tommy. "We can find out who bought the saw, and so discover the gink who tried to commit murder by sawing the ladders."
"And look here," Will went on, "do you see these threads hanging to the teeth of the saw? Do you see the color?"
"Blue!" replied the boys in a breath.
"That's right, blue. Now, what sort of a suit did the detective wear this morning? It was blue, wasn't it?"
"Sure it was!" replied George. "A blue serge! I noticed it particularly because it wasn't much of a fit."
"Well, these are blue serge threads!" commented Will.
"That's right, too," admitted Sandy.
While the boys still stood at the second level they heard some one moving down from the top. Will rushed around to the ladder and looked up.
He could not see the face of the man who was climbing down, but he could see that he did not wear a blue serge suit.
In a moment he called out to him, asking some trivial question regarding the action of the pumps. When the man looked down he saw that it was Canfield. The caretaker seemed surprised at finding the boys at the second level. He kept on descending.