It's 1969 and Mary Schormann is living quietly in Wales with her ex-POW husband, Peter, and her teenage twins, Richard and Victoria.
Her niece, Linda Booth, is a nurse - following in Mary's footsteps - and works in the maternity ward of her local hospital in Lancashire.
At the end of a long night shift, a bullying new father visits the maternity ward and brings back Linda's darkest nightmares, her terror of being locked in. Who is this man, and why does he scare her so?
There are secrets dating back to the war that still haunt the family, and finding out what lies at their root might be the only way Linda can escape their murderous consequences.