In Paris, in the beginning of the Twentieth Century, Cesar Charron owns a theater at the Rue Morgue where he performs the play "Murders in the Rue Morgue" with his wife Madeleine Charron, who has dreadful nightmares. When there are several murders by acid of people connected to Cesar, the prime suspect of Inspector Vidocq would be Cesar's former partner Rene Marot. But Marot murdered Madeleine's mother many years ago and committed suicide immediately after.
Aliens from a dying world plot to conquer earth by preying on man's superstitions. Bringing two dead scientists back to life, they use their knowledge to re-animate various earth monsters, including the werewolf, Frankenstein's monster, the mummy Tao-Tet, and the vampire Count de Meirhoff.
Shortly after his return from India, a special agent of the British secret service falls victim to an insidious poisoning in London. Scotland Yard gets involved. But too late: valuable information has fallen into the hands of an international criminal gang...
