Crouch got to his feet again. He could not cry out because of the gag that was still fastened in his mouth. He had no other means of making his whereabouts known than the method he had tried before. Again he threw his weight upon the door and fell heavily to the ground.

This time there could be no doubt that he had succeeded in his purpose. A man came to the outer door of the flat, tried to open it and failed, and then called out in a loud voice, asking who was within.

Neither Crouch nor Jimmy could answer. It must also be remembered that the room in which they were imprisoned was quite dark, save for the fact that a full moon had arisen which had cast upon the floor a square pattern criss-crossed by the shadows of the framework of the window. Since the flat was quite unfurnished and the walls of the passages were bare, human voices were magnified in sound, and it was possible to hear quite distinctly what was said by those outside the door. The voice of one man was particularly distinct. Not only was it louder than the others, but its tones were authoritative; it was he who gave orders to those who were with him. As they guessed from the very first, this was Superintendent-detective Etheridge--a man whose reputation in his own line of business was second to none.

"Go on, man!" he exclaimed. "Break the door down. There's no time to waste trying to force the lock."

There was a dull thudding sound, as the full weight of a six-foot London policeman was hurled against the door.

"Try again," said the detective; "and this time all four of us together."

There was a pause, during which, no doubt, the detective and his companions gathered themselves together; and then, as one man, they threw themselves forward, so that four heavy shoulders struck the door a single blow.

The combined weight of these men could not have been less than fifty-four stone, at the very lowest estimate; and that is a shock that a modern spruce-wood doorway was never constructed to stand. Not only was the lock broken open, so that the woodwork of the jamb was splintered for at least a foot, but the hinges were wrenched bodily away. The outer door flung back with a crash, and a second later the detective and his men found themselves in the passage of the flat.

"Which room is it?" cried Etheridge. "Where are you?" he shouted at the full power of his lungs.

Crouch could not answer by word of mouth, but he could do just as well. Sitting as upright as he could, he spun round like a top, so that his two heels rapped out upon the door. Then he rolled over and over, until he had gained the security of the centre of the room.