"Wouldn't you like to go up with me to-morrow, Chester?" asked Fritz, as he locked the door to the shop.
"I believe I would," was the reply. "I guess I can stand it if Hal can."
"Then you shall," said Fritz, and the three turned toward the house, where Frau Schmidt stood in the doorway, calling to them that supper was ready.
CHAPTER X.
IN THE AIR.
The boys were busily engaged in disposing of a hearty supper when there came a knock at the door. Frau Schmidt answered the knock, and, returning a few moments later, placed before Hal an important-looking letter, bearing the official seal of the German government.
Hal opened the document and read.
"Great Scott!" he exploded, after a hasty perusal.
"What's the matter?" demanded Chester anxiously.
"Why, here is an order, commanding us to report to the commanding officer the first thing in the morning, so that we may be transported back to Berlin!"