In the summer of 1999, Kit and Laura travel to a festival in Cornwall to see a total eclipse of the sun. Kit is an eclipse chaser; Laura has never seen one before. Young and in love, they are certain this will be the first of many they'll share. But in the hushed moments after the shadow passes, Laura interrupts a man and a woman. She knows that she saw something terrible. The man denies it. It is her word against his.

You see the people you work with every day, but what can't you see? Amira, Sarah, Paula, Ewan and Charlie have worked together for years - they know how each other likes their coffee, whose love life is a mess, whose children keep them up at night. But their comfortable routine life is suddenly shattered when an aggressive new boss walks in.... Now there's something chilling in the air. Who secretly hates everyone? Who is tortured by their past? Who is capable of murder?

Still traumatised by her brush with a psychopath, Detective Cassie Maddox transfers out of the murder squad and starts a relationship with fellow detective Sam O'Neill. When he calls her to the scene of his new case, she is shocked to find that the murdered girl is her double. What's more, her ID shows she is Lexie Madison - the identity Cassie used years ago as an undercover detective.

Anne and Marco Conti seem to have it all - a loving relationship, a wonderful home, and their beautiful baby, Cora. But one night when they are at a dinner party next door, a terrible crime is committed. Suspicion immediately focuses on the parents. But the truth is a much more complicated story.

Cass is having a hard time since the night she saw the car in the woods, on the winding rural road, in the middle of a downpour, with the woman sitting inside - the woman who was killed. She's been trying to put the crime out of her mind; what could she have done, really? It's a dangerous road to be on in the middle of a storm. Her husband would be furious if he knew she'd broken her promise not to take that shortcut home. And she probably would only have been hurt herself if she'd stopped.