Collects B.P.R.D. Hell on Earth: The Pickens County Horror #1-2, B.P.R.D. Hell on Earth: The Transformation of J. H. O'Donnell #1 and B.P.R.D. Hell on Earth (2012) #103-104.
*The B.P.R.D. crew investigates the site of a hundred-year-old magical ritual and Hellboy breaks into the secret library of a dead necromancer. *Source: darkhorse.com