Group Fifteen Files Books in Order
Below you'll find the complete list of Group Fifteen Files books in publication order. This is generally the recommended reading order for the series.
Reading order verified: January 2026
Publication Order
Scorpion (With: Steve Cavanagh)
Buy on Amazon2017
Witness X (With: Scott Mariani)
Buy on Amazon2017
Little Sister (With: Michael Ridpath)
Buy on Amazon2018
The Vault
Buy on Amazon2020
Wormwood
Buy on Amazon2022
Frequently Asked Questions
The recommended reading order for the Group Fifteen Files series is publication order: 1. Scorpion (With: Steve Cavanagh) (2017), 2. Witness X (With: Scott Mariani) (2017), 3. Little Sister (With: Michael Ridpath) (2018), 4. The Vault (2020), 5. Wormwood (2022). This is generally the best way to experience the story as the author intended.
The Group Fifteen Files series by Mark Dawson contains 5 books. The series began in 2017 and continues to be a popular choice for readers.
The Group Fifteen Files series is written by Mark Dawson. You can find more books and series by this author on our website.
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