“No fine phrases, my boy. Now, listen to me and weigh my words carefully. You will find they are worthy of your consideration. Now, Danègre, three weeks before the murder, you abstracted the cook’s key to the servants’ door, and had a duplicate key made by a locksmith named Outard, 244 rue Oberkampf .”

“It’s a lie⁠—it’s a lie!” growled Victor. “No person has seen that key. There is no such key.”

“Here it is.”

After a silence, Grimaudan continued:

“You killed the countess with a knife purchased by you at the Bazar de la Republique on the same day as you ordered the duplicate key. It has a triangular blade with a groove running from end to end.”