Rook and Ronin Spinoff Series Novels

Guns: The Spencer Book (Rook and Ronin Spinoff 4) by J.A. Huss
Bomb: A Day in the Life of Spencer Shrike (Rook and Ronin Spinoff 3) by J.A. Huss
Taut: The Ford Book (Rook and Ronin Spinoff 2) by J.A. Huss
Slack: A Day in the Life of Ford Aston (Rook and Ronin Spinoff 1) by J.A. Huss