BBC's original show Happy Valley is back for its third and final series after an explosive two seasons.
The Bafta-winning series stars Sarah Lancashire as Sergeant Catherine Cawood. When Catherine discovers the remains of a gangland murder victim in a drained reservoir, it sparks a chain of events that leads her straight back to Tommy Lee Royce, the rapist of her late daughter, and father of her grandson, Ryan.
Ryan is now sixteen, and has his own ideas about the kind of relationship he wants to have with his biological father.
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And while Catherine's sister Clare is caught in the middle, elsewhere a local pharmacist gets in over his head when a neighbour is arrested.
Season two aired back in 2016, with a prison pen-pal of Tommy's seeking revenge on Catherine. Frances had been led to believe Tommy was in love with her, so she coerced Ryan into giving his "dad" a second chance.
How many episodes of Happy Valley series 3 are there?
According to IMDb, there are six episodes of the third series, as there were in the previous two seasons.
The first episode will air on BBC One on January 1 (New Year's Day) at 9pm. The show will air weekly and will not be available to view as a boxset until after the final episode is broadcast.
Full cast list of Happy Valley series 3:
Sgt Catherine Cawood - Sarah Lancashire
Clare Cartwright - Siobhan Finneran
Ann Gallagher - Charlie Murphy
Tommy Lee Royce - James Norton
Ryan Cawood - Rhys Connah
Insp Mike Taylor - Rick Warden
PC Shafiq Shah - Shane Zaza
Daniel Cawood - Karl Davies
Happy Valley series 3 starts at 9pm on Sunday, January 1, on BBC One
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