"Is that so?"
"Yes; and it's lucky he didn't recognize us."
"I should say it is. Well, let's be moving."
The two lads left the restaurant and started on their journey again. They had not gone a block, however, when they halted at a sudden hail from behind them. Turning suddenly they saw the German officer hurrying after them.
"I can't get you off my mind," he said to Chester, as he came up. "I am positive that I have seen you some place, but for the life of me I can't tell where."
"Well, you have the advantage of me," replied the lad, his hand seeking his pocket and resting on the butt of one of his revolvers.
The two lads started to move on again, and at that moment the German explained:
"I have it! You are the lad who invaded our secret council in Louvain!"
Chester did not take the trouble to deny it, but as the German's hand went to his hip he said quietly:
"I wouldn't do that if I were you."