The accidental husband - Jane Green

Maggie and Sylvie are strangers: two very different women, living on opposite coasts. But they share more in common than they could ever imagine. Both women have beautiful children on the verge of flying the nest, a home they worked hard to build, and a handsome and devoted husband they can't believe belongs to them. Both think their lives are seamlessly secure, but they couldn't be more wrong
Each is about to discover a secret that will turn their world upside down, throwing into doubt everything they thought they knew, and bringing them together in the most unexpected way.