Stealthily the naturalist crept around, still hiding, until he was closer to the house on the other side. At last he worked his way around to the rear door. He tried it. It was bolted and even the skeleton key was unavailing to slide the bolt. Seconds were precious.

Quickly, he went to the corner of the house. There was a water-leader.
He began to climb it, risking its precarious support.

On the roof at last, the naturalist crawled along, looking for some way of getting into the house. But he could not seem to find any. Carefully, he crawled to the edge of the roof and looked over. Below, he could hear sounds, but could make nothing of them.

From his pocket, he took the leather case and opened it. There was a peculiar arrangement, like some of the collapsible arms on which telephone instruments are often fastened to a desk or wall, capable of being collapsed into small space or of being extended for some distance. On the thing was arranged a system of mirrors, which the naturalist adjusted.

It was a pocket periscope.

He thrust the thing over the edge of the roof and down, and looked through it. Below, he could see into the room from which came the peculiar sounds.

He looked anxiously. There he could see Elaine endeavoring still to loosen the cords and unable to do so. Only for a moment he looked. Then he folded up the pocket periscope into the case and shoved it back into his pocket. Quickly he crossed the roof again, and slid back down the rain-pipe.

At the door stood three of Del Mar's men waiting for Del Mar who had told them he would follow immediately.

The naturalist had by this time reached the ground and was going along carefully back of the house. He drew his revolver and, pointing it down, fired. Then he dodged back of an extension and disappeared for the moment.

Instantly, the three men sprang up and ran toward the spot where it seemed the shot had been fired. There was no one about the side of the house. But the wind had carried the smoke into some bushes beside the grove and they crashed into the bushes, beating about.