1880s, Essex. 1930s, California. Two opulent glass houses dominate the coastlines on opposite sides of the world, 50 years apart. The events that occur in each will unravel the mysteries of one old-money, aristocratic English family. One of the most inventive, mind-bending mysteries of recent years, this tête- bêche novel – where two interlinked stories are printed back-to- back – will delight fans of Stuart Turton and Anthony Horowitz.