There have been a few works called Between the Lines. The ones with pages here so far are:
- A webcomic about a bunch of transgender teenagers.
- A TV series about police Internal Affairs, London style.
- A one-panel comic strip in the New York Daily News.
- An fanfiction anthology based off of A Certain Magical Index.
Alternatively, you may have been looking for artistic meaning that's "between the lines" of a work, i.e. Subtext. Not to be confused with Between the Lions.
