Mark Clapham 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.
Mark Clapham
A standalone Imperial Guard novel by Mark Clapham following the Mordian Iron Guard, famed for their rigid discipline, as they are deployed to a mining world afflicted by a spreading corruption. As panic and rebellion take hold, the regiment finds itself beset by enemies from both within and without the local population.
000.M41 - 999.M41
era date, medium confidence
First published 2012
Mark Clapham
Huron Blackheart leads his Red Corsairs to seize the mysterious Hollow Worlds of Lastrati, only for a Space Wolves force to arrive and contest the prize. With neither the renegade tyrant nor the sons of Russ willing to relent, the fight for the strange artificial worlds escalates into a brutal, sprawling war.
667.M41 - 999.M41
era date, medium confidence
First published 2016