Not far away from where the Bradys stood they saw the big box lying beside the track, turned over on its side.
They ran back and hastily examined it.
"Empty!" ejaculated Harry, in some surprise.
"What has become of the man it contained?" asked Old King Brady.
"Search. He may have fallen out."
They carefully examined the ground within a wide radius.
But they found nothing of the missing body.
"Mysterious, what became of him!" Old King Brady exclaimed.
Harry was completely at his wits' end.
"I'm afraid we are beyond our depth, Old King Brady," he remarked. "This mystery keeps growing all the time, and we can't seem to fathom it."