If the reader thinks that a professor of mathematics could not write the fascinating book, other than on the theory of probability, it is wrong! If the reader imagines Ph.D. in math as an old gray-haired man, it is wrong again, because the author of this exciting detective story is a woman. Deductive theory and link analytics help Natalia not only in her professional activity, but in writing of mysterious detective stories. Enjoy reading other books from the series "Ill-fated adventures": the next meeting is at another time and in another country, but with the same memorable author Natalia Mstitelnaya: "Deadly cruise"; "I pack my suitcase and fly to Amsterdam!"; "The end of all problems" etc.