What is the name of the 2017 Twin Peaks book that follows up The Secret History of Twin Peaks?

The 2017 follow-up to The Secret History of Twin Peaks is titled Twin Peaks: The Final Dossier.

Mark Frost wrote the book as a companion to Twin Peaks: The Return. It is structured as a collection of FBI files and reports compiled by Tammy Preston, and it updates readers on many characters and events connected with the original series and the revival. The book provides information that is adjacent to, but not always shown directly in, the television narrative.

The Final Dossier was published in October 2017, during the period when the revival was expanding the series’ mythology for a new audience. Its material includes background on characters, changes in the town, and consequences of earlier storylines.

It is distinct from The Secret History of Twin Peaks, published in 2016. The earlier novel has a wider historical and archival scope, while The Final Dossier is more directly concerned with character outcomes and the aftermath of the original series.