A car lies crashed below a Welsh mountain road. One of the young women inside it is dead, the other badly injured with no memory of who she is or what just happened. All she has is a bus pass showing her photograph and a name she doesn't recognize. As she struggles to recover from her injuries, a startling revelation shatters everything she thought she knew, forcing her into an uneasy alliance with Detective Bronwen Pryce. With danger closing in from all sides, the two women must work together to uncover the truth - even if it kills them.

Dr. Grace Kendal never stands a chance. The injured woman comes out of nowhere, bleeding heavily and holding a gun. Compelled to help her, Grace is dragged into Elin Breckenridge’s nightmare. Their fight to survive will take them across the country and to the limits of their endurance. But who is Elin running from? As Grace struggles for answers, one thing becomes clear - Elin is somehow connected to a dead man, and Grace could be next.

Detective Jo Shaw has it all worked out. She’s good at her job, she has loads of mates, and she likes being single. She doesn’t need complications, but an emergency call to the stabbing of a young woman brings plenty of those. Jo has to risk her career to save the woman’s life, and a bad night gets worse when the trauma surgeon turns out to be Isla Munro, Jo’s only real love, who walked out on her 15 years ago and never came back.

Jemima Pardon, a paramedic with a daft name and chronic asthma, has never had much in the way of good luck. The only things she attracts are traumatic jobs, and no one wants to work with her for long. But when Jem bumps into devil-may-care police officer Rosie Jones, her fortunes seem to be changing. Rosie is bright and funny, and she doesn’t mind that Jem can’t go far without her inhaler.

Detective Sanne Jensen (not blonde, not tall, definitely not Scandinavian) and Dr. Meg Fielding (scruffy, scatterbrained, prone to swearing at patients) are lifelong best friends, sharing the same deprived background and occasionally the same bed. When a violent kidnapping stuns the Peak District village of Rowlee, both women become involved in the case.