It began with an affair. And ended in murder.

Sally is watching the news with her husband when she hears a name she ought not to recognise: Mark Bretherick.

Last year, a work trip Sally had planned was cancelled at the last minute. Desperate for a break from her busy life juggling work and a young family, Sally didn’t tell her husband that the trip had fallen through. Instead, she booked a week off work and treated herself to a secret holiday.

All she wanted was a bit of peace – some time to herself – but it didn’t work out that way. Because Sally met a man. Mark Bretherick. All the details are the same: where he lives, his job, his wife Geraldine and daughter Lucy. Except that the man on the news is a man Sally has never seen before. And Geraldine and Lucy Bretherick are both dead . . .