This is a work of art in the genre of science fiction. The third book of this series is also devoted to the topic of "Titanic". But it is the first part that I consider to be the most important and the only important book in the entire series.The plot of the novel is as follows: On April 10, 1912, engineer Frederick Goodwin boarded with his family.The Goodwin family left Britain while the scientist was studying the properties of a moving magnetic field. Goodwin's work resulted in the invention of the time machine.On the night of the sinking of the Titanic, Frederick Goodwin, his wife and children die in the crash. Only nine-year-old Harold manages to escape.Many years later, Harold completes his father's job. The appearance of an unexpected guest from the Titanic forces him to return to 1912.