After more than twenty years of life in London, Jean and Mark Hubbard decamp to a remote tropical island in the Indian Ocean. But when Jean, a health columnist, discovers a salacious love letter addressed to her husband, she realizes that she has misdiagnosed some acute pathologies in her own life. The long idyll of their mutual ease is over - and a new quest has just begun. Looking for answers, Jean goes undercover with a surreptitious correspondence that propels her on to alarming and illuminating adventures of her own. Isabel Fonseca explores the impulses that color and disrupt our lives even as they reveal, ever