"You're a wonder!" Jimmie cried, dancing about his chum and wrinkling his nose until it looked like that of a comedian in a motion picture. "I wonder if you haven't got a hunk of Washington pie in that keyster!"
The lads fell to work on their machines, and in a very short time all were ready for the road. Then Ned put away his handbag and began an examination of the large suitcase, which contained the larger repairs for the motorcycles. It had not been molested.
"There's one thing certain," he said, "and that is that the Chinese who are watching us expect us to make a dash for Peking. They took the pains to leave our machines in such shape that their tampering with them would not be suspected. I'd like to know just when this mischief was accomplished."
"Yes," Frank observed, "they wanted us to get out of Taku and break down on the road to Tientsin. They would have us at their mercy out there— or they figured it out that way."
"The work on the machines must have been done sometime during the day— or last night," Ned replied. "Possibly while we were dozing."
"I don't believe it!" Jimmie insisted. "I've had me eyes open every minute to-day."
"Well," Ned went on, laughing, "we had a high wind yesterday, didn't we? A wind that tumbled the dust of the streets in upon us? Well," pointing to a portion of his machine frame which he had been careful not to touch, "here is some of the dust which fell upon the motorcycle then. The person who did the job brushed a lot of the dust away, so, you see, he must have worked since the dust fell."
"Did he brush it all away?" asked Jimmie.
"No," Ned replied, pointing, "here is a brace which he touched with his hands but did not wipe off. In a short time I'll tell you just what sort of a chap it was that did the trick."
The boy got his camera out of the suitcase and took a picture of the spot on the machine frame where the print of human fingers showed. The motorcycle owned by, or in charge of, Jimmie also showed a similar mark, and this, too, was photographed.