Room Number 3, and Other Detective Stories

"What door is that? You've opened all the others; why do you pass that one by?" "Oh, that! That's only Number 3. A mere closet, gentlemen," responded the landlord in a pleasant voice. "To be sure, we sometimes use it as a sleeping-room when we are hard pushed. Jake, the clerk you saw below, used it last night. But it's not on our regular list. Do you want a peep at it?" "Most assuredly. As you know, it's our duty to see every room in this house, whether it is on your regular list or not."