The Reaper's Almanac is a multiplayer letter-writing rpg about safeguarding souls after death by ensuring that they are remembered.
It's 25 pages, with clean, readable layout and stunningly gorgeous cover art, but no interior illustrations.
Because of its heavier themes, the Almanac includes safety tool recommendations for the letter-writing format. It doesn't invent anything new, but it does suggest establishing Lines before you begin.
Content-wise, Almanac lets you take your story anywhere you want, but it also provides a campaign of sorts, adding a lot of helpful optional structure to gameplay.
The campaign is unexpectedly intense, and heads towards specific, structured outcomes, but you could probably use it as a novelling prompt as well. At bare minimum, this book is well-written and presents a web of compelling stories.
Overall, I would strongly recommend Reaper's Almanac both to folks who like letter-writing games and to folks who like choose-your-own-adventure-style gamebooks. It has a little of that latter energy to it, enough that it'll likely appeal to people who are hesitant about playing a correspondence game.