A new author, which means a new take on the characters and their dynamics. Not sure I like it, from the beginning Gotrek called the shots, but would sometimes listen to Felix's advice. That's gone, and the dynamic has changed to Gotrek goes, and Felix follows, simple as that. The byplay between the two is curtailed. That's either how Reynold's interpreted the characters, or a deliberate decision from Games Workshop, possibly since Felix is going to die sometime prior to the End Times cataclysm.
The book covered a trip to Karak Kadrin, the Slayer Keep, as it's besieged by Khornate cultists, with the ultimate goal of building a Road of Skulls along the same path that Grimnir marched ito the Chaos Wastes. A little bit of sieging, but less than Zombieslayer, and an interesting view of Khorne-worshippers as a little smarter than the mindless savages they're usually portrayed as. Further hints are given to Gotrek's backstory, like how he swore an oath, possibly out of love, to prevent Ungrim Ironfist, the Slayer King, from fulfilling his doom. The ending was fairly solid, with Gotrek being used to destroy what was essentially the Big Bad's horcrux, only for the Big Bad to be slain before he finished his goal of building the Road of Skulls by his cousin, a Tzeentchian sorcerer.