As long as you accept that the Lion captured Night Haunter at some point (and got rid of one of his close advisors who was in the DA books but doesn't appear in The Unremembered Empire), then you're good to go, but the short stories about the DAs are the best stuff about them in the Heresy Series.

But, Prince of Crows is in Shadows of Treachery, the one where the advisor is gotten rid of is in The Primarchs