Killing me softly - Nicci French

Is there anything we wouldn't sacrifice for true love?
Alice Loudon is a young woman who seems to have it all: a group of close friends, a loving boyfriend, a successful career. Then one day she meets a stranger, Adam, and - impulsively, immediately - gives up her safe, ordered existence for a passionate affair. It leads her to abandon her old life for a secret realm of experience that both entices and alarms her.
As Alice learns about Adam's complex and tormented past, she enters his world of risk and adventure and her initial curiosity turns to an obsession that threatens everything: her marriage, her sanity, and finally her life.