"There are four things I must do," he murmured: "first, pull up the string; second, throw it in the fire; third, draw out the nail; fourth, close the window."
He was pleased to notice that his heart was not beating faster than usual. "I think I have myself well in hand, yet I must not be too cool when I get downstairs. There are so many things to think of all at one time," he said to himself with a sigh. He looked up and down the street. The pavement was clear. He waited until the policeman had passed the door. He would take ten steps before he turned on his beat. When his back was towards the café door Dupré launched his bomb out into the night.
[Illustration: DUPRÉ LAUNCHED HIS BOMB OUT INTO THE NIGHT]
He drew back instantly and watched the nail. It held when the jerk came. A moment later the whole building lurched like a drunken man, heaving its shoulders as it were. Dupré was startled by a great square of plaster coming down on his table with a crash. Below, there was a roar of muffled thunder. The floor trembled under him after the heave. The glass in the window clattered down, and he felt the air smite him on the breast as if some one had struck him a blow.
He looked out for a moment. The concussion had extinguished the street lamps opposite. All was dark in front of the café where a moment before the Boulevard was flooded with light. A cloud of smoke was rolling out from the lower part of the house.
"Four things," said Dupré, as he rapidly pulled in the cord. It was shrivelled at the end. Dupré did the other three things quickly.
Everything was strangely silent, although the deadened roar of the explosion still sounded dully in his ears. His boots crunched on the plaster as he walked across the room and groped for the door. He had some trouble in pulling it open. It stuck so fast that he thought it was locked; then he remembered with a cold shiver of fear that the door had been unlocked all the time he had stood at the window with the canister in his hand.
"I have certainly done some careless thing like that which will betray me yet; I wonder what it is?"
He wrenched the door open at last. The lights in the hall were out; he struck a match, and made his way down. He thought he heard groans. As he went down, he found it was the concierge huddled in a corner.
"What is the matter?" he asked.