Shirley uttered an exclamation.
“Barred!” she said.
“That’s nothing,” laughed Mabel. “Surely you remember all windows are barred in Mexico.”
“That’s so,” agreed Shirley.
After some further inspection of the room, Mabel crossed to the door through which they had come, and turned the knob. Then her face paled and she stepped back with an exclamation of alarm.
“What’s the matter, Mabel?” asked Shirley.
For a moment Mabel did not reply. Again she turned the knob and then she stepped back and looked at Shirley.
“It’s locked!” she declared.
CHAPTER XXII.—CAPTAIN VON BLUSEN BOBS UP AGAIN.
“Are you sure?” asked Shirley, her face also turning a shade whiter.