Dan Abnett’s WH40K Inquisitor Eisenhorn trilogy is now available on Audiobook. You can get it from Black Library or Audible. The narrator is Toby Longworth, who does a lot of WH40K audio-work and who is IMO outstanding.
If you’re at all interested in WH40K a lot of us recommended the Eisenhorn trilogy when the topic of good WH40K books came up.
The first book of the Ravenor Inquisitor trilogy is also currently available on Black Library, but not on Audible yet.
I also got the WH40K audio drama Agent of the Throne: Blood and Lies via the Black Library iOS App also available on the Black Library website . I thought it was a lot of fun. Basically 1-hour drama (with multiple voice actors and voice effects) about an agent working for an inquisitor who has to root out a chaos cult on a planet.