“Mrs Verloc,” he said, “it strikes me that you know more of this bomb affair than even you yourself are aware of.”

Mrs Verloc sat still, amazed, lost in boundless astonishment. What was the connection? And she became so rigid all over that she was not able to turn her head at the clatter of the bell, which caused the private investigator Heat to spin round on his heel. Mr Verloc had shut the door, and for a moment the two men looked at each other.

Mr Verloc, without looking at his wife, walked up to the Chief Inspector, who was relieved to see him return alone.

“You here!” muttered Mr Verloc heavily. “Who are you after?”

“No one,” said Chief Inspector Heat in a low tone. “Look here, I would like a word or two with you.”

Mr Verloc, still pale, had brought an air of resolution with him. Still he didn’t look at his wife. He said:

“Come in here, then.” And he led the way into the parlour.

The door was hardly shut when Mrs Verloc, jumping up from the chair, ran to it as if to fling it open, but instead of doing so fell on her knees, with her ear to the keyhole. The two men must have stopped directly they were through, because she heard plainly the Chief Inspector’s voice, though she could not see his finger pressed against her husband’s breast emphatically.

“You are the other man, Verloc. Two men were seen entering the park.”

And the voice of Mr Verloc said: