Another Lost Soul from the Lion's Sons

Hi all, I am fairly new to the collecting and hobby aspects of this game, collecting Dark Angels successor and Dark Eldar.
I love the lore. Having read Andy Chamber's series, is there another good Black Library you can suggest?

May there always be victims before you.

Lukas the Trickster by Josh Reynolds. The story follows a space wolf maverick, Lukas, as his planet is the victim of a real space raid by Duke Sliscus. They are good foils and you will get chapters from each perspective. Sadly not too many stories with Dark Eldar protagonists you have to get used to seeing them as the "bad guys".