A furnished flat at $8 per week. It did not exactly beggar description, but it certainly had that word on the lookout for the mendicancy squad. In the vestibule below was a letter-box into which no letter would go, and an electric button from which no mortal finger could coax a ring. 
 In the passage above, the author’s word choice creates a mood of _____.
 mystery
 romance
 barrenness
 hopefulness