B.P.R.D. 1948 #1-5. What can I say, it continues as excellently as it started. It's not only world bulding and telling in-between stories (i.e. between teh arrival of Hellboy and the modern day), these are really great stories.

The next book is actually a spin-off of one of the arcs in this omnibus, B.P.R.D. Vampire and when I took the book off the shelf I saw that I'm in for more Gabriel Bá and Fábio Moon art