The spy had stepped down from the train and stood there waiting to meet his contact and pass off the packet. But the conductor and a pesky boy were hanging around. His contact would be spooked.
He waited until the conductor called “All aboard” before giving up and walking for the train. Suddenly he heard footsteps behind him running toward him. He turned as the boy crashed into him and fell to the ground. “Sorry, sir,” the boy said and jumped up and ran.
It was not until he was back on board that he realized the packet was missing.