Transylvania, 1941: as the spectre of the Holocaust reaches Romania it falls to Andreea Petrescu, a Romani biology student, to go on the run from an SS Einsatzgruppen with her irascible, superstitious father. Their flight leads them to seek refuge in ancient Dacian catacombs, where they discover they are not the first to have taken shelter.
Though her father is repulsed by their discoveries, the scientifically-minded Andreea finds herself fascinated by the activities of the mysterious resistance unit that has set itself up in the area, and of their leader, the charismatic and ruthless Miss Bendice. She seems eager to recruit Andreea to her cause, and offers her an opportunity to escape from her degrading circumstances, but at no small cost.
Forging unlikely friendships with a naïve Wehrmacht lieutenant, an amnesiac teenage vampire, and a scatterbrained Welsh parapsychologist, Andreea's knowledge, courage, and integrity are put to the test as she struggles to survive, save her loved ones, and stay true to her principles, though it may entail sacrificing her dreams.