Headhunters of Nuamerica by Stanton A. Coblentz

There was a stunned sensation in Downey's head as he slowly regained consciousness. He had the feeling of one who has been drugged, or sandbagged; and for a moment he could not quite recall where he was or what had happened to him. He was only aware of a dull, hammering sound from somewhere in the distance; and aware also of the aching pain and the stiffness in every joint and muscle of his body. It seemed to him at first that his eyelids were glued together, and would never open; and when at length he forced them apart, he realized that he was in darkness, except for a faint light that slowly widened at the further end of a narrow gallery.

A low moan from just ahead of him caused him to reach out; and, more by feeling than by sight, he recognized the slim form sprawled full-length on the floor. Judith Barclay! As this name flashed across his mind, recollection came back with a great leap, and his tortured brain reconstructed the scenes of the last hour or two. The announcement of the outbreak of war, followed almost immediately by the appearance of the raiding planes! His appeal to Judith, when for the twentieth time she had shrugged her thin shoulders and refused him; then the alarm, and their flight together through the panicky crowds toward the air-raid shelters! Their terrified halt, when a bomb plowed up the street just before them; and their dash into an immense section of concrete pipe, where some construction work was under way! And, finally, the thudding sound of a concussion; Judith's scream -- and darkness!