Marny Bannister is a skilled female chemistry scientist whose face is marked by an unpleasant angioma. One day, following a theory of a mad alchemist, she develops a drug which transforms her into a charming and fascinating red-haired woman, but the drug has an unexpected side effect making her a murderous criminal mastermind. As Satanik, she does not hesitate to use instruments of death to satisfy her desires.
The main antagonist of Satanik is the policeman Lt. Trent, whose companion Satanik had killed.
Satanik was innovative in the fact she took advantage of her sex appeal to conduct her crimes, and some proto-erotic scenes appeared in the series. The series had several problems with censorship and some of the books were confiscated by authorities.