The Secret Diary of Laura Palmer was first published in 1990. The Twin Peaks tie-in novel was written by Jennifer Lynch, David Lynch’s daughter, and presented as Laura Palmer’s private diary.
The book expands Laura’s inner life and provides material connected to the television series’ mystery. It is written as a fictional personal document, making it different from an ordinary episode guide or behind-the-scenes companion. Its publication during the show’s original run helped deepen the story’s mythology beyond the broadcast episodes.
The diary should not be confused with The Autobiography of F.B.I. Special Agent Dale Cooper: My Life, My Tapes, another Twin Peaks tie-in book published in 1991 and written by Scott Frost. The diary’s fictional author is Laura Palmer, but its real-world author is Jennifer Lynch.