Mitchel Scanlon has 2 books in the Warhammer 40,000 catalogue, listed below in publication order with where each fits on the timeline.
Original summaries and chronology labels generated from the same catalog powering the atlas.
Mitchel Scanlon
A grim Astra Militarum entry point about an ordinary Guardsman thrown into industrial-scale war, making the human cost of the setting immediately clear.
000.M41 - 999.M41
era date, medium confidence
First published 2005
Mitchel Scanlon
A Dark Angels-focused Heresy novel that reaches back into Caliban and shows how older loyalties complicate the Legion's future.
846.M30 - 846.M30
approximate date, medium confidence
First published 2007