"Because it's too near the sideboard. I can't get my eye there to sight along the pistol barrel."
"You mean your right eye?"
"Of course."
"Could you get your left eye there?"
"Yes, but if I aimed with my left eye I'd have to fire with my left hand and I couldn't hit a cow that way."
Coquenil looked at Tignol steadily. "You could if you were a left-handed man."
"You mean to say—" The other stared.
"I mean to say that this man, at a critical moment, fired through that awkward hole near the sideboard when he might just as well have fired through the other hole away from the sideboard. Which shows that it was an easy and natural thing for him to do, consequently——"
"Consequently," exulted the old man, "we've got to look for a left-handed murderer, is that it?"
"What do you think?" smiled the detective.