After watching a good film, I often go online to read more about it. I recently re-watched The Prestige and afterward found out that the book on which it was based was written as an “epistolary” novel.
1. contained in or carried on by letters: an epistolary friendship.
2. of, pertaining to, or consisting of letters.
Wordsmith Wednesdays made-up example sentence:
One thing Errol greatly regretted after enlisting in the military was that it had forced his marriage into an epistolary state.