"Still, we've had a great many warnings," I objected.
"I know that," she persisted, "but they have all come from very unreliable sources."
"Very well," I agreed finally, "then let's drive over to his bungalow."
Elaine ordered her little runabout and a few moments later we climbed into it and Elaine shot the car away.
As we rode along, the country seemed so quiet that no one would ever have suspected that foreign agents lurked all about. But it was just under such a cover that the nefarious bridge and harbor-mining work ordered by Del Mar's superiors was going ahead quietly.
As our car climbed a hill on the other side of which, in the valley, was a bridge, we could not see one of Del Mar's men in hiding at the top. He saw us, however, and immediately wigwagged with his handkerchief to several others down at the bridge where they were attaching a pair of wires to the planking.
"Some one coming," muttered one who was evidently a lookout.
The men stopped work immediately and hid in the brush. Our car passed over the bridge and we saw nothing wrong. But no sooner had we gone than the men crept out and resumed work which had progressed to the point where they were ready to carry the wires of an electric connection through the grass, concealing them as they went.
In the study of his bungalow, all this time, Del Mar was striding angrily up and down, while his men waited in silence.
Finally he paused and turned to one of them. "See that the coast is clear and kept clear," he ordered. "I want to go down."