Do you (or do any agents you know) have a knee-jerk reaction to novels with correspondence of some sort beginning the novel?
(Chapter 1: "Dear Killer Yapp, Your evil stares are insufferable. Signed, The Black Cat from Central Park.")
Assuming the information in the letter has a point and that seems to be the best way to convey it. Is it overdone, something every agent dreads seeing? Do you say "Oh no, not one of these again!" and reach for the gin as soon as you start reading?
Ella Minnow Pea
You write something like this and I'll read it. I don't have a knee jerk antipathy toward letters like I do weather, dreams, prologues, deceased canines, flowing tresses, or dark and stormy nights....yet (even with "Dear Miss Snark" coming at her in droves in her mailbox).
Write well. That's it.
You can even write a prologue about the weather and if you do it well enough I'll read it.
The hard truth is 99.9% of the things I read AREN'T done well enough to ignore the "no prologue no weather" prejudice.
it's a very very astute writer who knows what they don't know how to do well...yet.
I learned that from Lisa Selin Davis who wrote an amazing book called Belly.