The rich but lonely Doriana Grey (Lina Romay) lives in an old castle together with her servant Ziros. An American reporter (Monica Swinn) visits her to write an article which might also help Doriana uncover a mysterious secret buried in her past. The secret turns out to be a twin sister who is hidden in a psychiatric hospital, run by the mysterious Dr. Orloff. Born as Siamese twins but separated after birth, Doriana suffered some sort of trauma, while her sister’s became mentally defective. Doriana is a frigid vampire, telepathically connected to her twin sister who actually experiences the enjoyments which elude Doriana.