An Astra Militarum novel

Caught between rebels and orks on the icy Danik's World, a company of Vostroyan Firstborn are cut off and must survive behind enemy lines while escorting a vital traitor through territory filled with threats…

READ IT BECAUSE
It doesn't get much more classic than the Imperial Guard fighting orks… and throw some rebels, a secret mission and tension with high command, and you have all the makings of a stone cold (or ice cold, perhaps) classic.