Humphrey Bogart makes his first and last appearance in a horror movie in this film. Though the title implies that it is a sequel to the classic 1932 chiller Dr. X it is not. The terror begins when an eager-beaver reporter stumbles across the corpse of a popular actress who turns up, after much media hoopla, not to be dead at all. At least she seems to be alive on a surface level and is eager to sue the reporter's paper. The reporter can't help but notice that here skin is unnaturally pale and that she keeps her face concealed beneath a long-black veil. Suspecting that evil is afoot, he--who by now is unemployed--launches a private investigation to prove that she really was the corpse he saw. His search leads him into the terrifying world of a psycho blood doctor, and into a series of unsolved murders in which all the victims were found with no blood in their veins. Ultimately, the reporter finds himself face-to-face with the nefarious Dr. Maurice Xavier (Bogart), a man executed several years ago for murdering patients while performing Frankensteinian experiments.