Freeman Wills Crofts, The Cask — Chapter 27 (1920)
“ La Touche so arranged his departure that he was immediately behind Boirac in this queue. As the manufacturer put down his money La Touche saw his finger. The scar was there!“Here at last is certainty,” thought the detective, as he drew back out of the other’s sight. “So Boirac is the man after all! My work is done!”And then the annoying afterthought arose. Was his work done? Was the proof he had got of Boirac’s guilt sufficient? There was still the alibi. Always that alibi loomed in the background, menacing his success. ”
