"What on earth is Tom driving at?" Harry wondered. "He's stringing
Don Luis, of course, but to what end?"

Montez stood at the door of his office, indicating that the young engineers pass in ahead of him. The instant they had done so Montez turned to his secretary, whispering:

"Send my daughter here."

Dr. Tisco vanished, though he soon reappeared and entered the office.

Don Luis, after indicating seats to the young Americans, crossed to a ponderous safe, toyed with the combination lock, threw open the door and then brought out a ledger that he deposited on one of the flat-top desks. Five minutes later his daughter Francesca entered the room.

"Now, what part is the girl to play here?" wondered Tom, instantly. "If I know anything of human nature she's a sweet and honest girl. She is no rascal, like her father. Yet he has sent for her to play some part!"

CHAPTER IX

DON LUIS SHOWS HIS CLAWS

Senorita Francesca greeted her guests with extreme courtesy.

"She's a fine young woman," thought Harry, with a guilty feeling. "Blazes, but it's going to come hard to show her father up as a scoundrel."