“We take it in turns—two at a time—to sit up with Potts.” Hugh glanced at the other three. “Damn it—you blighters—wake up!”

Darrell struggled to his feet and walked up and down the room.

“I don’t know what it is,” he said, rubbing his eyes, “I feel most infernally sleepy.”

“Well, listen to me—confound you ... Toby!” Hugh hurled a tobacco-pouch at the offender’s head.

“Sorry, old man.” With a start Sinclair sat up in his chair and blinked at Hugh.

“They’re almost certain to try and get him to-night,” went on Hugh. “Having given the show away by leaving a clue on the wretched secretary, they must get the real man as soon as possible. It’s far too dangerous to leave the—leave the——” His head dropped forward on his chest: a short, half-strangled snore came from his lips. It had the effect of waking him for the moment, and he staggered to his feet.

The other three, sprawling in their chairs, were openly and unashamedly asleep; even the dogs lay in fantastic attitudes, breathing heavily, inert like logs.

“Wake up!” shouted Hugh wildly. “For God’s sake—wake up! We’ve been drugged!”

An iron weight seemed to be pressing down on his eyelids: the desire for sleep grew stronger and stronger. For a few moments more he fought against it, hopelessly, despairingly; while his legs seemed not to belong to him, and there was a roaring noise in his ears. And then, just before unconsciousness overcame him, there came to his bemused brain the sound of a whistle thrice repeated from outside the window. With a last stupendous effort he fought his way towards it, and for a moment he stared into the darkness. There were dim figures moving through the shrubs, and suddenly one seemed to detach itself. It came nearer, and the light fell on the man’s face. His nose and mouth were covered with a sort of pad, but the cold, sneering eyes were unmistakable.

“Lakington!” gasped Hugh, and then the roaring noise increased in his head; his legs struck work altogether. He collapsed on the floor and lay sprawling, while Lakington, his face pressed against the glass outside, watched in silence.