Recs if you like Diary of a Haunting...

Epistolary delivery: Books told in the form of letters, journals, diaries, texts, logs, etc...

Mixed media: The combined use of media. Epistolary: Of or associated with letters or the writing of letters. A collection of books that stray from conventional writing by using different forms of media (letters, newspapers clippings, transcripts, blog posts, emails, etc. )