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 darkes...