Group Fifteen Files Books in Order
This page lists all Group Fifteen Files novellas by Mark Dawson in order, with story summaries, series background and how they connect to the John Milton thrillers.
Last updated: December 19, 2025
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Publication Order
5 books
Wormwood
by Mark Dawson
2022
The Vault
by Mark Dawson
2020
Little Sister
by Mark Dawson
2018
Witness X
by Scott Mariani
2017
Government agent Bryan Duffy, disgraced after a political scandal, is exiled to Spain until his old unit calls him back. When North Korean hitmen target a woman in London, he becomes her last line of defence and uncovers a deadly plot inside the Group Fifteen underworld.
Scorpion
by Steve Cavanagh
2017
They call him Scorpion, a legendary contract killer hired to silence an investigative journalist in London. When John Milton moves to protect her, the assassin finds his perfect record threatened in a short, relentless clash between hunters.
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