Abbie has come through a difficult divorce from Keith, who recently became a best-selling author of books for children and now lives with Fiona, his illustrator. Abbie is trying to build a new life in Dundee with her 11-year-old twin girls. Her friend Kate persuades her to try internet dating and after a couple of false starts she meets Bill. Their first meeting, which includes a walk across Lunan Bay, goes well and Abbie is optimistic. But when the twins start to have nightmares and behave badly at school, Abbie can't help but wonder if her new relationship with Bill is somehow responsible. When the truth emerges, it is far from anything Abbie expected and strains the family to breaking point.