Suranne Jones and Lesley Sharp return in Sally Wainwright's drama exploring the personal and professional lives of two female detectives - Rachel Bailey and Janet Scott.
After the murder of Rachel's ex-boyfriend Nick Savage in Season 2, the third season reveals how Rachel finally managed to prove she was innocent and keep her job.
She's now married to new boyfriend Sean, but did she go through with the wedding for the right reasons? Meanwhile, Janet fails to patch things up with husband Adrian and they decide to divorce.
And for the first time, this season follows one crime story across all eight episodes, with Nicola Walker starring in a tale of murder and deception that pushes Scott and Bailey to their limits.
Janet is subtle, reliable and a diplomatic thinker with a wry sense of humour, which makes her the perfect foil for Rachel. She has two daughters and is in a marriage that can often feel like nothing more than a convenient arrangement to both her and her husband.
Behind her straight facade is a woman who is capable of infidelity and has suffered an emotional breakdown over the murder of a childhood friend, an event which drove her to join the police force.
Rachel is energetic, impulsive, and bold. Her intuition makes her a great cop, although her boss unfairly views her as a liability. Often burning the candle at both ends, Rachel's spur of the moment ideas and vulnerability often lead to disaster in her private life and subsequent law breaking of her own.
Detective Chief Inspector Gill Murray leads a team of over thirty detectives, including Rachel, Janet and Detective Sergeant Andy Roper. A divorced single parent, Gill is a hugely capable woman, whose speedy thought processes require everyone around her to raise their game to keep up with her.
Charismatic, funny, clever, fair-minded, occasionally scary, a paradigm of professionalism, Gill is an inspiring detective and leader, always at the centre of the office scene.
Scott and Bailey are both competent, ambitious women, passionate about getting the job done effectively. Neither of them suffer fools. They draw on each other's strengths every day to deal with extreme and horrific crimes.