Pressure is mounting within the Bureau for Paranormal Research and Defense to uncover the Soviets' Secret Plans for recovered Nazi occult weapons. But a suspicious cover-up leads one agent off the radar in search of answers. meanwhile, demonic Soviet occult leader Varvara pushes her team to follow her own whims, and Hellboy is sent on the mission that led to his infamous misadventures in Mexico. But even more clandestine plots are at work—both inside the B.P.R.D. and out!