Digby showed him the ventilator grating through which he had smelt the incense, and when Leon stooped, the faint aroma still remained.

“We will try the factory first. If that draws blank, we’ll ask Dr. Oberzohn’s guidance, and if it is not willingly given I shall persuade him.” And in the reflected light of the lamp George Manfred saw the hard Leon he knew of old. “This time I shall not promise: my threat will be infinitely milder than my performance.”

They came to the dark entry of the factory, and Manfred splashed his light inside.

“You’ll have to walk warily here,” he said.

Progress was slow, for they did not know that a definite path existed between the jagged ends of broken iron and debris. Once or twice Leon stopped to stamp on the floor; it gave back a hollow sound.

The search was long and painfully slow: a quarter of an hour passed before Leon’s lamp focussed the upturned flagstone and the yawning entrance of the vault. He was the first to descend, and, as he reached the floor, he saw, silhouetted in the light that flowed from the inner room, a man, as he thought, crouching in the doorway, and covered him.

“Put up your hands!” he said.

The figure made no response, and Manfred ran to the shape. The face was in the shadow, but he brought his own lamp down and recognized the set grin of the dead man.

Gurther!

So thus he had died, in a last effort to climb out for help.