Your neighbour's wife / Tony Parsons.

What do you do when your perfect life spins out of control? Tara Carver seems to have the perfect life. A loving mother and wife, and a business woman who runs her own company, she's the sort of person you'd want to live next door to, who might even become your best friend. But what sort of person is she really? Because in one night of madness, on a work trip far from home, she puts all this at risk. And suddenly her dream life becomes a living nightmare when the married man she spent one night with tells her he wants a serious relationship with her. And that he won't leave her or her precious family alone until she agrees. There seems to be only one way out. And it involves murder ...