Novel library / English / Mystery
The Unknown
By Riley Sager
Mystery · United States · 2026
Summary
Riley Sager’s The Unknown follows an actor arriving with a film crew on an isolated island connected to the century-old disappearance of five spiritualists. When members of the modern crew begin to vanish, a surviving journal becomes a route into the island’s history and a possible way out.
Book details
- Author: Riley Sager
- Original language: English
- Genre: Mystery
- Publisher: Dutton
- Status: Published
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Themes
悬疑 · 超自然悬疑 · 孤岛谜案
Reading highlights
- The title and author always appear together to avoid same-name confusion
- A modern film crew echoes an earlier disappearance
- The isolated island and surviving journal shape the investigation
About the author
Riley Sager
Riley Sager is the pen name of an American suspense novelist whose books include Final Girls, The Last Time I Lied and The House Across the Lake.
Official editions and reading
Use the linked publisher page for the exact ISBN and page count. Search results for other books and screen works titled The Unknown do not describe Riley Sager’s edition.
- Penguin Random House official book page — Verify publication data and find current authorised formats for The Unknown.
Frequently asked questions
What is The Unknown about?
A production team enters a location already marked by an unsolved disappearance. New vanishings force the central actor to compare present evidence with the old journal and decide whether the threat is human, supernatural or both.
Who wrote The Unknown?
The Unknown was written by Riley Sager. This page links its factual claims to the publisher or author source.
Do I need to read another book first?
This is a standalone work and can be read without another book first.
How many pages is The Unknown?
Use the linked publisher page for the exact ISBN and page count. Search results for other books and screen works titled The Unknown do not describe Riley Sager’s edition.
Which The Unknown does this page cover?
This guide covers the Riley Sager novel. The author name is kept in the title, description and page text because many unrelated works share the same name.
Where can I read or buy The Unknown legally?
Use the Penguin Random House page to see the authorised print, ebook, audiobook or sample options available in your market. NovelRove does not host the book text or unauthorised downloads.
Sources and verification
- Penguin Random House official book page — 2026-08-30
