When Ella Longfield overhears two attractive young men flirting with teenage girls on a train, she thinks nothing of it - until she realises they are fresh out of prison and her maternal instinct is put on high alert. But just as she’s decided to call for help, something stops her. The next day, she wakes up to the news that one of the girls - beautiful, green-eyed Anna Ballard - has disappeared.

It seems like an ordinary Wednesday, until the phone rings. A mysterious caller with a chilling threat. Journalist Alice Henderson hangs up, ready to dismiss it as a hoax against the newspaper. But the next Wednesday, the stalker makes another move - and it becomes clear that this is all about Alice. Someone wants her to suffer, but for what? Her articles have made her a popular local champion - could it be her past rather than her work that’s put her life in danger?

Holly never thought she'd move back to her hometown, but then something terrible happened. She doesn't know if she can recover. But she knows she can never tell another soul. People say her neighbour, David, is 'different'. He doesn't go out much, and never after dark. But in David, Holly finds just what she needs: a friend. Someone who's always there. No-one knows Holly's secret or where she lives. She has left the past behind. So why does she feel as though she's in terrible danger?

On a train with her husband, miles from home and their four-year-old son, Ben, Sophie receives a chilling phone call. Two boys are in hospital after a tragic accident. One of them is Ben. She thought she could trust Emma, her new friend, to look after her little boy. After all, Emma’s a kindred spirit—someone Sophie was sure she could bare her soul to, despite the village rumours. But Sophie can’t shake the feeling that she’s made an unforgivable mistake and now her whole family is in danger.

It’s their daughter’s graduation and Rachel and Ed Hartley are expecting it to be one of their family’s happiest days. But when she stumbles and falls on stage during the ceremony, a beautiful moment turns to chaos: Gemma has been shot, and just like that, she’s fighting for her life. PI Matthew Hill is one of the first on the scene. A cryptic message Gemma received earlier in the day suggests someone close to her was about to be exposed. But who?