Two hundred feet was the range of the rays! Was Kashtanov that close? Obviously the controls had not yet been set, for he still held the box. But he could switch them on in a second and fling the deadly machine up toward the dam, if he were at present just out of range. A second--a second! "Damn you, here goes!" roared Chris. He wrenched the stick way over. The plane appeared to hang crazily on one wing. Then it leveled off and stuck its nose down, flipping its tail up, and down--down--down it bellowed; with no hope in the world of ever coming out of its insane plunge. What he saw in that last momentary glimpse was burned forever into Chris Travers' memory. There was the black box, hanging in the air straight before the plane's thundering nose; there, behind it, the black tide of the spillway waters; and, still further behind, he could see the other bank and the hydro-electric station, and a few tiny figures that rushed out from it just then to see what some fool flyer was doing. All this flashed into his sight, etched against the sable night as if in flame. Then the plane's snout smashed into the black box hanging before it, and the propeller crunched through a naked, invisible body. A ragged scream that marked the passing of Kashtanov split through the air for a flash of time, and the dark, blurred mass that was an airplane teetered clean over and flopped into the rushing spillway channel. * * * * * The men who had scrambled out from the hydro-electric station stared at each other blankly. One of them stuttered: "But--he did that deliberately! Nothing went wrong with his ship! I saw him! He seemed to be diving at something!" "Come on!" snapped another. "We might be able to get him out. A mad fool like that's just the kind who'll live through it." * * * * * End of Project Gutenberg's Raiders Invisible, by Desmond Winter Hall