If only things had been different, Lucy Potts, 43-year-old mother of two, would be married to Hugh Ashby – the man she loved and lost. Instead, she married his best friend, Simon.

And then a devastating car crash leaves her unconscious, and she finds herself revisiting the crucial moments in her past. But everything is slightly different. Suddenly, she is able to change all the things she’s always wished she’d done differently.

But by concentrating on her past, she is forgetting about all the things she would miss in the present, and as she comes round, she makes a devastating discovery.