Sergeant Cawood's world stops when the man who drove her daughter to suicide is released from prison, and Kevin's split-second decision devastates Nevison.

Catherine's search for Tommy gains momentum when she receives a tip-off regarding his whereabouts. Helen absorbs the shock of hearing that Ann has been abducted.

Tommy brutally takes control of a situation when PC Kirsten McAskill pulls him and Lewis over. His actions have devastating consequences.

Catherine's focus returns to the job in hand as she searches for the owner of the suspicious Milton Avenue property, with dramatic consequences.

Catherine sinks into a deep depression as she learns that Tommy is still at large. The net finally closes in on Kevin.

Things get tense at Catherine's birthday party when a drunk Daniel reveals a different version of past events with Becky. Catherine's fears grow when she learns that Tommy has been spending time with Ryan.

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Even behind bars, Tommy finds a way to keep an eye over Ryan.

Catherine arrives home with Ilinka, an emaciated Croatian woman who has been rescued after being trafficked and enslaved for the past four years. Meanwhile, John's panic over Vicky's threat spills out into his home life.

Tommy urges Frances to go further with her attempts at making Catherine's life a misery.

A birthday gift for Ryan reminds Catherine that danger may be closer than she thinks.

Daniel suspects somebody at school might be responsible for Ryan's interest in Tommy.

Catherine confronts Frances, while John's torment leads him to desperate measures.

When Catherine discovers the remains of a murder victim, it bizarrely leads her straight back to Tommy Lee Royce.

Catherine learns of a painful betrayal close to home, and Faisal comes under increasing pressure from all sides.

Catherine confronts Clare and presents Ryan with an ultimatum. Faisal and Joanna hatch a plan that takes an unexpected turn.

As Tommy’s big day approaches, Catherine becomes suspicious, and Ryan finds a new way to defy her.

Catherine races to protect her family as a murder investigation begins.

Scores are settled for good on Catherine’s final shift, and Ryan faces a moral dilemma.

Writer Sally Wainwright looks back on the origins of her Bafta-winning drama Happy Valley, which first appeared on the nation’s TV screens in 2014. She reveals just how happy the early days really were - sharing the inside story of how the show first came together, the challenges faced, and the pressures of living up to expectations once the series established itself as an acclaimed success.