Before they were vanquished by the B.P.R.D., Lovecraftian monsters created a Hell on Earth As society rebuilds, strange cults vie for influence, and the demon Varvara emerges to lead the way ... Abe Sapien returns from his self-imposed exile to rejoin Liz Sherman just in time for the Bureau to face the final threat to mankind. Collects B.P.R.D The Devil You Know issues #1-#5.

Hellboy has returned to earth and reunited with the B.P.R.D. to help lead the push against one demon's quest to turn New York City into a new Pandemonium. With the demon Varvara gathering followers from all over the country to do her bidding and create this new Hell on earth, the B.P.R.D. tracks her to New York, where she calls other demons of Hell to her side and transforms her cultists into an army of demons and zombies to take down the agents standing in her way. Collects B.P.R.D.: The Devil You Know #6-#10.

The finale to B.P.R.D., Hellboy, Abe Sapien, Liz Sherman, and the rest of the bureau face off against one of their oldest enemies in the last battle to save the world. One enemy leads to another as the B.P.R.D. finds themselves up against something—and someone—even more sinister than they believed, and Christopher Mitten draws the origin story of one of the B.P.R.D.'s most mysterious foes. Collects B.P.R.D.: The Devil You Know #11-15.

Lovecraftian monsters ravage an apocalyptic earth as the B.P.R.D. fights to save what little of humanity they can. But even Hellboy is not who he once was, and whether anyone survives Varvara and the long-awaited Ragna Rok remains to be seen. Written by Mike Mignola and Scott Allie and brilliantly rendered by artists Laurence Campbell, Sebastián Fiumara, Christopher Mitten, and Mignola himself, this this omnibus is a must have! Collects B.P.R.D.: The Devil You Know: Messiah, Pandemonium, and Ragna Rok.