Series 1 Sarah Lancashire stars as Catherine Cawood, a police sergeant in a small town in Yorkshire where drunkards, drug addicts and teenage pregnancies are a way of life. Her world is turned upside down when the man she believes is responsible for her daughter’s death – Tommy Lee Royce – is released from prison. She is convinced Tommy is dangerous and it’s only a matter of time before he hurts someone else… Series 2 Catherine Cawood is back heading up her team of dedicated police officers in the Calder Valley. A body is discovered and the victim’s injuries bear a striking similarity to a string of other murders over the previous few months, suggesting a serial killer is on the loose. But the case becomes even more shocking when it emerges that Catherine knows the victim – something that could have serious repercussions for both herself and her family.