In his previous science-fiction novel, Last and First Men, Olaf Stapledon envisioned 2 billion years of history, in which modern humans represented the first and most primitive of 18 increasingly advanced species. In this companion piece, a being from the remote future travels back to the 20th century to inhabit the consciousness of an Englishman named Paul. From inside his subject's mind, the superintelligent mega-human observes Paul's childhood, his experiences during World War I, and his postwar life as a teacher. The narrative provides a compelling commentary on modern life, the horrors of warfare, and the disintegrating state of Western society. British philosopher William Olaf Stapledon (1886–1950) introduced several innovative concepts to the science-fiction genre, and his books influenced Arthur C. Clarke, Brian Aldiss, C. S. Lewis, John Maynard Smith, and many others. In this science-fictional self-portrait, he offers a captivating combination of memory, imagination, and social criticism.