An epistolary novel is a novel written as a series of documents. The usual form is letters, although diary entries, newspaper clippings and other documents are sometimes used. Recently, electronic "documents" such as recordings and radio, blogs, and e-mails have also come into use.
-Wikipedia
This is the second generation of Ford Series, you can check it out on my profile. Nonetheless, my every epistolary stories can be a stand alone and only made as a series to organize it. Thank you and happy reading!
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