This science-fiction book tells the story of remarkable seekers whose work helped science understand one of the most important laws of living nature: the birth of the cell theory. Through the bitter fates of Robert Hooke and Gregor Mendel, the inquiries of Jan Purkinje and Theodor Schwann, the outstanding research of Ivan Pavlov and Rudolf Virchow, and the precise experiments of modern Soviet cytologists and geneticists, the book reveals a three-century history of the development of scientific thought—the culmination of which was the modern understanding of the cell as a unified elementary system of life. The path of inquiry, watered with heavy sweat to reach truth, is shown. The book is intended for a wide range of readers.