In the wake of the second world war, Professor Trevor Bruttenholm—occult investigator and guardian of the infant Hellboy—founded the Bureau for Paranormal Research and Defense to investigate and defuse the remains of the Axis’s sophisticated occult warfare projects and potential Soviet threats. Now, outfitted with a small band of war-weary Allied soldiers, Bruttenholm begins to unravel the mystery of the Nazi Occult Bureau’s greatest and most threatening initiatives: Project Vampir Sturm.