Keeping their eyes open and ever on the alert, they wandered about the streets and into many public places, but up to eleven o'clock had made no discovery. Then they entered a cantina for breakfast, purposely choosing one that was little frequented by Americans.
Seating themselves at a table in one corner where they could see without being seen, the boys ordered a hearty breakfast and then turned their attention to the others in the place.
At the table nearest them were three men of ordinary appearance, busy with their meal. Beyond them was an American soldier, who seemed to have dropped in out of curiosity. He was paying very little attention to his meal, but was eyeing a young woman who was seated behind the cash counter.
On the other side of the room, and partially hidden from our boys by the cash counter, was another man, smoking, and evidently waiting for some one. He kept his eye on the door and every once in a while glanced nervously at his watch.
"Not much going on in here," said Donald in English.
"No; but we are a little early. There may be more in before we finish our breakfast."
It was a true prediction, for within the next five minutes as many more persons entered and disposed themselves around the various tables. Then the boys' breakfast was served and for a few minutes they were more absorbed in the food than in the guests.
As Donald raised his eyes for a moment, however, he caught sight of a man talking to the one sitting back of the cash counter. They were evidently arguing about something in an undertone and a minute later the newcomer took a seat with his back to the boys.
"Look!" was Donald's smothered exclamation, "over there by the cashier. Isn't that our man?"
Adrian raised his eyes and gazed hard at the back of the man's head.