At once Roger raced to the door into the hall.

With no current the lock, with his key inside, turned readily.

Intuition told him what had happened here, as in the other instance.

The cellar fuse box had been opened and a fuse had been removed. That prevented current from entering the circuits, and even the alarm was silent, although he knew that cutting off the current served as well as any other way to start the recorder disk and the camera. He cut them off hurriedly.

“I’ll want them, maybe, a little later,” he told himself. “Whoever did this will have to come up two flights of stairs. It will give me just time to re-adjust them to go on again, if I want. And I hope he or she or it left the fuse by the box.”

He had a plan. A trap, made useless to protect him, could be made useful to hold someone else!

Slipping into his bathroom, with his clothes carefully tucked under his arm, Roger unlocked the door into Grover’s adjoining room.

He went in there stealthily.

Then, waiting, he listened.

His one danger lay in the chance that the miscreant might come by way of Grover’s room, if it was known to be empty.