1	"Time of Death: Part 1"	
Manchester-based DI Helen Weeks informs her boyfriend and fellow detective Paul that she is pregnant. While Paul is overjoyed by the news, Helen is apprehensive. Helen returns to her rural home town of Polesford, Derbyshire, after learning that the husband of her childhood best friend, Linda, has been arrested for the abduction of two young girls. Meanwhile, local DI Tim Cornish is under pressure to close the case and is keen to pin the crime on Linda's husband, Stephen.[8]

2	"Time of Death: Part 2"	
Helen and Paul continue to have misapprehensions about the case, bolstered by the advice of their colleague Phil, an MPD coroner. As the evidence proving Stephen's innocence builds up, Helen is forced to confront a vicious crime from her past as well as troubles in her relationship with Paul, then a break in the case leads to a race against time to save the other kidnapped girl.

3	"In the Dark: Part 1"	
As a 38-week pregnant Helen is about to take maternity leave, she is struck by a personal tragedy which threatens to upend her life. Meanwhile, a novice gang member finds himself in over his head after his initiation, and unknowingly connected to Helen.

4	"In the Dark: Part 2"	
As she tries to reconcile the facts of her loss with her own doubts, Helen digs deeper into Manchester's criminal underworld, only to be hit with a betrayal she never saw coming.