No big deal, just the ~155th Warhammer book I've read* according to Goodreads.
This one was actually surprisingly fun, set on Terra (grimdark Earth, duh) featuring a mad plot to stop the Emperor being a perpetual vegetable. Featuring a not so surprise appearance from Henry Cavill's chosen faction, the Custodes. I guess you need to be a movie star to afford these shiny bois.
Inquisitor stories are always a good read.
*I am very cool