This unique device revolutionized our understanding of the ancient world. However, the history of the Antikythera Mechanism, named after the Greek island of Antikythera, off the coast of which its fragments were raised from the bottom of the sea, is full of dark spots. For many decades it was kept in the National Archaeological Museum of Greece, without attracting much attention to itself. The scientific world knew about its existence, but even scientists could not believe that it was not a hoax, and the amazing mechanism used to calculate the movement of celestial bodies actually reached to us from the depths of centuries. Only thanks to the enthusiasm of a few scientists who could not ignore this mystery, it was possible to date the mechanism and make its reconstruction. More than a century has passed since this amazing discovery, but only now can we say that its secret has finally been revealed. However, work on the study of the Antikythera mechanism continues and is far from completed. The book by Joe Merchant tells about how the “first computer” was found, about the people who devoted themselves to studying it, and about the most amazing mechanisms in the history of mankind.