Meet Merlin. He's Lucy's bright, beautiful son - who just happens to be autistic. Since Merlin's father, the reserved, cerebral workaholic Jeremy, left them in the lurch shortly after Merlin's diagnosis, Lucy has made Merlin the centre of her world. Struggling with the joys and tribulations of raising her adorable yet challenging son, Lucy doesn't have room for any other man in her life ... so why bother trying to find one?

When Lucy realises she's becoming increasingly cynical about life in general, she finally resolves to dip a toe back into the world of dating. Things don't go quite to plan, yet just as Lucy is resolved to a life of singledom once more, the most imperfectly perfect man for her and her son lands on her doorstep. But then, so does Jeremy, begging for forgiveness and a second chance....