“We are wasting precious time,” she said.  “Come.”  Then, turning to Donna Ana, she said sharply:  “You will stay here until I return.  And if you betray me—­” Again she made a threatening gesture, and again the old duenna cowered.  Thereupon, the girl hastened from the room and Jack followed.

Up the spiral stone stairway of the tower ran Rafaela, passing the first landing where burned an electric light.  Jack was close at her heels.  At length they reached the top landing, and stood before the single door there.  It was of stout oak, heavy and ponderous.

“This is your father’s room,” whispered Rafaela.

So near to a successful conclusion of his adventure, Jack’s heart beat so rapidly that once again he experienced that sensation of suffocation which had seized him on landing from the airplane.

He tried the door knob.  The barrier was locked.

“Locked,” he whispered.  “What shall we do?”

In the dim light on the landing, they stared at each other in dismay.  Here was a contingency which had occurred to neither.

The whispering, the careful trying of the door, the sound of their footsteps—­these had aroused Mr. Hampton from his reading on the other side of the door.

“Who’s there?” he called sharply.

Jack set his mouth close to the keyhole.

“Dad,” he whispered tensely.  “It’s Jack.  Don’t make a noise.  I’ve come to rescue you.”

There was a moment of silence, then the sound of rapid footsteps crossing the room.

“Jack?” Mr. Hampton also had stooped to the keyhole.  “It can’t be.  Yet that voice!  My boy, my boy.  But how in the world did you come here?”

“Too long to tell, Dad,” whispered Jack.  “But have you the key to this door?”

“Key?  No.”

“Then,” said Jack, despairingly, “it looks as if we were balked at the end.  This door is too stout to break down without bringing the enemy on us.  It’s thick and bound with iron straps besides.”

“Who is with you?”

“Bob.  No.  I mean Miss Calomares.  She’s helping me.”

“This is too much for me,” declared Mr. Hampton.

“Dad, we’ll have to break down the door.  The government troops are attacking.  Even if we do make a lot of noise, it may go unnoticed.  Have you a heavy chair you can use?”

“Yes,” answered his father.  “But, wait.  Government troops attacking, hey?  Then that is the meaning of those shots which caused Don Fernandez to leave me so hurriedly.”

“No, Dad, those first shots were when they sounded the alarm on discovering me.”

“They discovered you?” Mr. Hampton groaned in mock dismay.  “Oh, this is too much.  But, Jack, what I started to say was that as Don Fernandez dashed down the steps, I heard him drop something in his haste that rang on the stones.  Maybe that was the key.”

“I’ll look.”

Jack stood upright, and communicated to the impatient Rafaela what his father had said.  She had been unable to hear.  Fortunately, he carried an electric torch.  Swinging this so that the light fell on the steps, he started downward.  Before he had gone three steps, the girl’s quick eyes saw the key gleam in the light.  She snatched it up with an exclamation, turned, inserted it in the keyhole, and the door swung in.