Synopsis: n the war-weary year of 1940, just one rundown hospital survives London's collapse. Sister Barbara, a nun and volunteer nurse, inspires hope in her patients, but that faith is shaken when an unidentified aircraft explodes near the hospital. The half-eaten corpse beneath the mangled wreckage appears to corroborate the pilot's story that some sort of "tentacle-monster" attacked his plane. However, Sister Barbara pushes these dangers aside and plunges beyond the rubble when the man she loves disappears in the wastelands. She discovers a bloodstained beauty in his place—but the girl's outward innocence hides a voracious sexual appetite, and an even more disturbing secret. One by one, the terrified patients vanish from their beds. Titillating tentacles lick the hospital walls at night. And the dreams, always the dreams, drawing Sister Barbara deeper into a well of madness. She suspects she and the other women at the hospital are transforming into something... unholy. Sister Barbara knows she must figure out what before the evil in their midst consumes them all.