Set in the distant future, this science fiction novel tells the story of a world facing environmental and technological challenges. As pollution and disasters lead to the banning of nuclear facilities and the depletion of oil reserves, humanity is forced to rely on manual labour and tamed gibbon-like animals, officially known as "simian auxiliary population elements" or SAPES, to work the fields and avoid famine. The story follows Julian, Inez, and their family as they navigate this new world and grapple with the mysterious prediction of "The Day of Doom," found on an old parchment in the ruins of a monastery. With fast-paced action and thought-provoking themes, this book is a must-read for fans of science fiction and post-apocalyptic tales.