The novel by the master of the detective genre, written by him in collaboration with his friend and colleague Grant Allen. This is not only a fascinating detective story, but also an adventure travel novel. It plays on the idea of the responsibility of scientists and doctors for the side effects of medications and sounds very modern topic of pharmacological manipulation: “... the mystery associated with this is by no means so deep that it cannot be revealed in principle. In any case, there were no insurmountable obstacles for a person endowed with powerful intellect, competence and the desire to unravel all the intricacies of this case... only women’s intuition turned out to be sharp enough to feel that there was a cruel injustice in this case.” What is unique? this novel? The detective, a kind of analogue of the beloved Sherlock Holmes, is a woman named Hilda Wide. It was she who stood between a man who committed a crime for the sake of his career and for the sake of science (more precisely, for the sake of himself in science) and was able to conduct an investigation. Mighty Evil (in the person of the famous but unprincipled Professor Sebastian), naturally, was defeated and before his death admitted his guilt. The text also has its own Doctor Watson, also a doctor by profession (Dr. Cumberledge), but he is connected with the newly-minted Holmes in a lady’s guise not just by friendship, but also by hope for something more.