The Tain by China Miéville

A sudden, immense silvered surface appears over London, a mirror-like phenomenon that refracts and distorts the city and its inhabitants; the narrative follows how this uncanny spectacle draws curiosity, fear, exploitation and devotion from citizens, politicians, activists and opportunists alike, exposing social fault lines and prompting moral and political confrontations as people try to interpret, control or profit from the inexplicable intrusion into their everyday lives.