I am going to take the case largely bceause it has interested me,
changed to: I am going to take the case largely [because] it has interested me,
Chapter IV
Duvall examined this house next door with a great deal of interest
changed to: Duvall examined this house next door with a great deal of [interest.]
"Nothing, so far. I confess the thing is somewhat of a puzzle.
changed to: "Nothing, so far. I confess the thing is somewhat of a [puzzle."]
Chapter V
...eyes of the two men were tent curiously upon her,
changed to: ...eyes of the two men were [bent] curiously upon her,