Roger and Jimmy, sitting in the cave with the light turned low, presently heard a slight noise. At first they imagined it was made by one of their prisoners, but a moment of listening told them it was from another source.
"The Fritzies are coming!" whispered Roger.
"Be ready," advised his chum. "Have you the rifle?"
"Yes; and Wilbur's revolver, too."
"Good! Here they are, and out goes the glim!"
As he spoke Jimmy turned down the lantern completely, and there followed a guttural exclamation.
"Why is the darkness?" asked a voice in English. "Are you there Herren Bixtons?"
"Um," murmured Jimmy, nudging Roger.
"What is the matter?" asked the voice of the unseen one again. "You tell us to meet you here, and yet you have no light."
"Out of oil," growled Jimmy. "Maybe you have a flashlight. "