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 more clearly, the nature of love.