What you don't know - Lizzie Enfield

You've been together for fifteen years. You've got two gorgeous kids and a great career. All the boxes are ticked. You wouldn't be tempted by a plain, slightly balding man called Graham... Would you?

When Graham Parks walks into Helen Collins' life, the last thing she expects is to fall for him.

He's nothing like her handsome, successful husband, Alex.

But fifteen years is a long time and Helen can't help wondering what it would be like to sleep with someone else. Has Alex secretly been thinking the same thing? As harmless flirtation develops into something far more complicated, Helen's perfect world begins to look shaky.

It's exciting, alluring, all-consuming. But is it worth the risk?