His Last Command

This book, number nine in Dan Abnett's increasingly-upsetting Gaunt's Ghosts series, takes place about a year-and-a-half after the Gereon mission. Despite an extremely rocky path getting back into Imperial safe-space, Gaunt and his team find yet another major problem to deal with: in their commander's absence, the Tanith First-and-Only have been subsumed into a Belladon regiment under the control of one Colonel Wilder. Which would be enough to contend with, if it weren't also for the fact that the Sparshad Mons antique "city" thing the Guard are trying to clear Chaos forces out of is a completely insane place, and terrifying monsters keep appearing out of nowhere. Gaunt and his team's reappearance disturbs things not only for Wilder and the Belladon but also for the Tanith and Verghastite troops who had assumed them all long-dead. This vein of doubt and discomfort runs throughout the book, as does the increasing apparency that - having survived on a Chaos-held world for fifteen months, these prodigal comrades are on another level of proficient in dealing death and destruction (not to mention, quite seriously-questionably corrupted from their long exposure to Chaos). The Guard win the day, but it's a close call, and one only made possible by the heightened specialisation of the Gereon team and their return into the Imperial intelligence networks. The ending of this book is heart-breaking, even if it's characters you barely know.* Is that a spoiler? Probably. Sorry.

* True fact - this was the first Gaunt's Ghosts book I ever read. I found it in my local library, a fourteen-year-old who had been painting and playing Warhammer 40k for about four years, but had never read one of its books - and even with no familiarity with the characters or context, the sheer scale and depravity of war I was exposed to in these pages blew my tiny young mind. Needless to say, I read it twice, took it back, paid my late fee, and as soon as I could afford it started buying up the whole series from the start. And part of me still wishes I hadn't, because however good they are, Dan keeps stabbing me in the feel-bone.