Epistolary works use letters, diary entries, or other documents to tell a story. Bram Stoker's 'Dracula' is an example of an epistolary novel.
Pro Tip 2/3
Character Insight
Epistolary novels can provide deep insight into characters' thoughts and feelings. In the epistolary sections, we learn secrets the characters don't tell anyone else.
Pro Tip 3/3
Personal Touch
Epistolary writing often feels more personal, as if reading someone's private letters. The epistolary style made me feel a direct connection to the protagonist's experiences.