“You have been followed here⁠—not a doubt of it. When we leave the house we shall be followed again, but not molested, for it is Mr. Brown’s plan that we are to lead him . But the Soho house is under police supervision night and day. There are several men watching it. When we enter that house, Mr. Brown will not draw back⁠—he will risk all, on the chance of obtaining the spark to fire his mine. And he fancies the risk not great⁠—since he will enter in the guise of a friend!”

Tuppence flushed, then opened her mouth impulsively.

“But there’s something you don’t know⁠—that we haven’t told you.” Her eyes dwelt on Jane in perplexity.

“What is that?” asked the other sharply. “No hesitations, Miss Tuppence. We need to be sure of our going.”

But Tuppence, for once, seemed tongue-tied.