The B.P.R.D. (Bureau of Paranormal Research and Defense) is the organization started by Hellboy and this is the third softcover collection of the Plague of Frogs storyline collecting three B.P.R.D. trades.
Following the Bureau's catastrophic encounter with the monster-god Katha-Hem, Kate heads to France with hopes of bringing Roger back to life, and Daimio reveals the truth about his death in the jungles of Bolivia. The coming frog apocalypse heats up as Abe meets a secret society of Victorian cyborgs with ties to his origins, and Liz's visions grow increasingly dire! From Hollow Earth
to King of Fear
--the entire war on frogs in four volumes!