'Tell him; go up at once,' David managed to whisper, though his tongue almost stuck to the roof of his mouth. 'I am going back to Henricksen.'

He slid off at once, slipped behind a huge showcase, and then stared back through the glass at the two Russians. And as he did so the tight feeling about his chest and neck slowly lessened. He drew in the first comfortable breath he had taken for some minutes. A sigh almost escaped him; for Spolikoff had been absolutely deceived. It was clear that he was not in the smallest degree suspicious. He had taken our hero for the Admiral, and was obeying instructions in a manner almost child-like. He went at once to Ovanovitch, and for a few seconds they whispered on the stairs. Then they turned their backs to the ground floor and went up two steps at a time, as if eager to get to their destination.

'Got 'em,' David could have shouted, though he restrained himself, hugging his arms instead. 'Got 'em, I do believe. Now for the rest of the business.' His brain had been working hard in the last few minutes, and already he had mapped out a course of procedure. After all, that was exactly like the young fellow; his friends knew him to be exceedingly practical. Edward Harbor, his father, had endeavoured to train his boy to conduct matters of any moment with sense and discretion.

'Decide first of all what you're going to do,' he had often said. 'Don't start without a plan, all haphazard, and find when you are half way through that matters aren't promising. Stand away a bit, as it were, and have a clear view; then make your plans, and set to at the business.' Practical? Of course it was. Common sense management? Who can doubt it? A little advanced for one of David's age? Certainly, if you wish so to describe it. But that is worth remedying. Others can be trained as our hero had been, and the training has its undoubted advantages; for a practical young fellow is of infinitely greater value in these strenuous days than a lad always wool-gathering, who lacks energy and initiative, who begins a task only to fail, who succeeds only where a course of procedure has been already laid down, and when previous practice has made perfect. It is the uncertainties we want to train our lads to face, as well as the hum-drum certainties of this life.

'Got 'em,' David ejaculated again, in a deep whisper. 'Now to close the holes and divide the conspirators. First downstairs—that is the main burrow I have to see to.'

He had lost all his trepidation now. True, he was more than a little excited; but his hand no longer shook. He had seen already the possibilities of making a gigantic success of what had at first appeared to be an enormously difficult task. Straightway he stole across to the stairway leading to the basement, and tripped down three steps at a time. Then he ran across to the cupboard through which the four men had gained access to the store. Out came his electric torch, and a beam was flashed into the interior.

'As I thought: these fellows must have hired a house or a room in one of the buildings lying up against this place, and have knocked a hole clean through the wall. Then they cut through the back of the cupboard. No; no they didn't; they bored holes through the wood in a big circle, and so managed to remove a piece without making a sound. If they had employed a saw I should have heard them. Now, I shut the cupboard, and lock the door.'

It was not a flimsy affair, this cupboard, but a strongly built piece of furniture, firmly attached to the wall, and having doors which slid along in grooves. David gently moved the doors into place, found a key in the lock, and shot the bolt to. Then he tried to open the cupboard. It was closed and defied his efforts.

'Number one loop hole gone,' he said. 'Now for the warning and number two.'

He had planned out the whole course of movement, and came hopping up the stairs again, three at a time. A quick glance told him that the oxy-acetylene flame was still in use. A dull glow on the ceiling told its tale without shadow of error, while as he listened a gentle buzz came to his ear. From the upper floor there was not so much as a sound. At once he crossed to the door, and pulled the flap of the letter-box open. Click! Down went the glare over by the manager's office. Lying prone on the floor, and staring in that direction, David saw a man's head protruding from the opening. Then the fellow stepped out and stood listening. A whisper came to his ear, and at once the Admiral—for he it was without doubt—slid back into the manager's office to help in the task of forcing the safe. The reflection on the ceiling told its tale again promptly.