The interview with Frau Pfeffer the next day seemed to establish the fact of Hans Metzger's identity with the patient of the Dresden hospital, as the description tallied exactly with that of Frau Pfeffer's brother.
"Do you know anything about the old book?" Nan asked.
Frau Pfeffer did not know, but it was like her brother to have such. He was fond of reading, of husbandry, of outdoor life, and he could very well have come into possession of such a volume.
A few days later Dr. Paul had another report to make. "I've heard from Bob Morgan," he said. "The man Hans Metzger has gone to America."
"To America!" All looked at one another quite taken aback.
"Do you think, Dr. Paul, that he has then deserted his little daughter?" asked Miss Helen.
"I can tell better when we get particulars. Bob Morgan had only time for a line. This is what he writes: 'Have followed up the Hans Metzger matter. Find the man sailed for America from Bremen on Dec. 10. Will write details later.'"
"It's as good as a Sherlock Holmes story," said Nan. "I wonder if your Dr. Morgan saw Hans' footprint on the gangplank or the print of his thumb in a booking-office, or what."
"It does become rather exciting," admitted the doctor, "and I am curious myself to learn particulars."
"You'll be sure to let us know as soon as you find out, won't you?" begged the girls.