"Poof!" he said. "I shall have Mr. Fenley's murderer hanged long before your picture is hung. London provides one front-rank tragedy a week, but not another such masterpiece in ten years. Burn it because of a sentiment! Perish the thought."
"If I had guessed you were coming here so promptly it would have been in ashes an hour ago," said Trenholme, grimly insistent on sacrifice.
With a disconcerting change of manner the detective promptly assumed a dryly official attitude.
"A mighty good job for you that nothing of the sort occurred," he said. "Your picture is your excuse, Mr. Trenholme. What plea could you have urged for spying on a lady in an open-air bath if deprived of the only valid one?"
"Look here!" came the angry retort. "You seem to be a pretty fair judge of a drawing, but you choose your words rather carelessly. Just now you described me as 'hidden' behind that clump of trees, and again you accuse me of 'spying.' I won't stand that sort of thing from Scotland Yard, nor from Buckingham Palace, if it comes to that."
Furneaux instantly reverted to his French vein. His shrug was eminently Parisian.
"You misunderstand me. I allege neither hiding nor spying on your part. Name of a good little gray man! The President of the Royal Academy would hide and spy for a month if he could palliate his conduct by that picture. But, given no picture, what is the answer? Reflect calmly, Mr. Trenholme, and you'll see that mine are words of wisdom. Burn that canvas, and you cut a sorry figure in the witness box. Moreover, suppose you treat the law with disdain, how do you propose explaining your actions to Miss Sylvia Manning?"
"In all probability, I shall never meet the lady."
"Oh, won't you, indeed! I have the honor to request you to meet her tomorrow morning by the shore of that sylvan lake at nine fifteen, sharp. And kindly bring both sketches with you. Only, for goodness' sake, keep this one covered with a water-proof wrap if the weather breaks, which it doesn't look like doing at this moment. Now, Mr. Trenholme, take the advice of a dried-up chip of experience like me, and be sensible. One word as to actualities. I'm told you didn't see anything in the park which led you to believe that a crime had been committed?"