The Duel of Dr. Hirsch — G.K. Chesterton

"You mean the information is wrong?" asked Father Brown. "Wrong," replied the other, "and wrong exactly where Dr Hirsch would have been right-about the hiding-place of his own secret formula in his own official department. By favour of Hirsch and the authorities, the Duke and I have actually been allowed to inspect the secret drawer at the War Office where the Hirsch formula is kept. We are the only people who have ever known it, except the inventor himself and the Minister for War; but the Minister permitted it to save Hirsch from fighting. After that we really can't support Dubosc if his revelation is a mare's nest."