He had plenty of nerve. He had plenty of experience along his chosen line of endeavour. But while a crook may control his nerve, he cannot make it phlegmatic or steady. Always, he must be conscious of holding it in check, as a clever driver checks and steadies and keeps in subjection a plunging horse. Let the vigilance slacken, and there is a runaway. Now this particular marauder had long ago keyed his nerve to the chance of interruption from some gun-brandishing householder; and to the possible pursuit of police; and to the need of fighting or of fleeing. But all his preparations had not taken into account this newest emergency. He had not steeled himself to watch unmoved the gliding away of a treasure-satchel, apparently moving of its own will; nor the shimmer of two greenish sparks in the air just above it. And, for an instant, the man had to battle against a craven desire to bolt. Lad, meanwhile, was having a beautiful time. Sincerely, he appreciated the playful grab his nocturnal friend had made in his general direction. Lad had countered this, by frisking away for another five or six feet, and then wheeling about to face once more his playfellow and to await the next move in the blithe gambol. The pup could see tolerably well, in the darkness;—quite well enough to play the game his guest had devised. And of course, he had no way of knowing that the man could not see equally well. Shaking off his momentary terror, the thief once more pressed the button of his flashlight; swinging the torch in a swift semicircle and extinguishing it at once; lest the dim glow be seen by any wakeful member of the family. That one quick sweep revealed to his gaze the shiny brown bag a half-dozen feet ahead of him, still swinging several inches above ground. He flung himself forward at it; refusing to believe he also saw that queer double glow of pale light, just above. He dived for the satchel with the speed and the accuracy of a football tackle. And that was all the good it did him. Perhaps there is something in nature more agile and dismayingly elusive than a romping young collie. But that “something” is not a mortal man. As the thief sprang, Lad sprang in unison with him; darting to the left and a yard or so backward. He came to an expectant standstill once more; his tail wildly vibrating, his entire furry body tingling with the glad excitement of the game. This Sportive visitor of his was a veritable godsend. If only he could be coaxed into coming to play with him every night—! But presently he noted that the other seemed to have wearied of the game. After plunging through the air and landing on all fours with his grasping hands closing on nothingness, the man had remained thus, as if dazed, for a second or so. Then he had felt the ground all about him. Then, bewildered, he had scrambled to his feet. Now he was standing, moveless, his lips working.