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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 ill...