“They are a very astute and unscrupulous pair. While suspicion was to be directed against him, she would be making quiet preparations for a very different denouement. She arrives from Middlingham with all the compromising items in her possession. No suspicion attaches to her. No notice is paid to her coming and going in the house. She hides the strychnine and glasses in John’s room. She puts the beard in the attic. She will see to it that sooner or later they are duly discovered.”

“I don’t quite see why they tried to fix the blame on John,” I remarked. “It would have been much easier for them to bring the crime home to Lawrence.”

“Yes, but that was mere chance. All the evidence against him arose out of pure accident. It must, in fact, have been distinctly annoying to the pair of schemers.”

“His manner was unfortunate,” I observed thoughtfully.

“Yes. You realize, of course, what was at the back of that?”

“No.”