The possibility of paleocontact - an ancient visit to Earth by aliens - has been and remains the topic of dozens, if not hundreds of books. But Robert Temple's monograph, The Sirius Mystery, stands out among them as the most in-depth study carried out to date. Temple starts from the most convincing trace of paleocontact - the mysterious astronomical knowledge of the African Dogon people and goes deep into the ancient mythologies of Egypt, Sumer, Greece and even China, finding there echoes of knowledge about the Sirius star system and about life on other planets of the Galaxy. Undoubtedly, this knowledge could not have been obtained by the ancients on their own. And Temple comes to a logical conclusion: five thousand years ago, the foundations of earthly civilization were laid by intelligent aliens from Sirius. Perhaps their spaceship is still visiting the solar system.