Another woman's husband - Sarah Duncan

Becca thought she was happy. She's been with her husband Martin so long it rarely occurs to her that there could be any other way; her fourteen-year-old daughter is growing up to be confident and clever; and she has an unusually good relationship with her parents. But when her mother announces that she's leaving Becca's father, suddenly everything changes. Becca's in freefall, as everything she thought was certain is slipping away. When Martin becomes too preoccupied with training for the marathon to listen to her concerns, Becca is drawn, dangerously, to a man who has no right to pursue her.... Whether her marriage will survive or not, Becca's woken up, and she's never going to be quite the same woman again.