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 Well, we soon ran the dynamo, and had a good light going, one that was almost too glaring in that confined space. All of us were present, including the maid Mulliner, as slowly we examined and tested, piece by piece, every bolt, nut, strainer, and indeed every part of the machine.

It was past three o'clock in the morning ere we finished, yet we could find absolutely nothing wrong. The engines worked well: the dynamo was in order, the intensified current for the working of the invisible wave was up to the high voltage as before, and as far as we could discover the machine had not been tampered with in any way.

'They intended to investigate the secrets of the box,' Teddy remarked. 'No doubt that's what they were after.'

'Well—they didn't see very much!' I laughed, for already I had been up to the locked attic to which we had carried it on the previous night, and found it there with the door still secure.

Then, having satisfied ourselves that no damage had been done, we all retired to rest.

But sleep did not come to my eyes.

Hour after hour I lay awake until the grey dawn, pondering over the events of that night. That a desperate plot of the enemy was afoot against us could not be doubted, and I realized that it would take all our ingenuity and foresight to combat the plans of an unscrupulous enemy well provided with money, and desperate upon a resolve.

To go boldly to the authorities and denounce Lionel Eastwell as a spy would avail me nothing. Indeed, there was no actual evidence of it. No more