The return will see Sgt Catherine Cawood played by Sarah Lancashire learn the remains of a gangland murder victim in a drained reservoir.
The discovery sparks a chain of functions top to Tommy Lee Royce, played by James Norton.
Along with fixing the murder, Catherine will have to deal with her connection with her grandson Ryan, now 16 who has his own strategies about the sort of romance he wishes to have with his father, Tommy.
In other places, in a different section of city, a local pharmacist finds themselves above their head when a neighbour is arrested.
Happy Valley Forged
- Catherine Cawood: Sarah Lancashire
- Tommy Lee Royce: James Norton
- Clare Cartwright: Siobhan Finneran
- Nevison Gallagher: George Costigan
- Ryan Cawood: Rhys Connah
- Daniel Cawood: Karl Davies
- Andy Shepherd: Vincent Franklin
- Ann Gallagher: Charlie Murphy
- Neil Ackroyd: Con O’Neill
- Richard Cawood: Derek Riddell
- Shafiq Shah: Shane Zaza
- Gorkem Tekeli: Mete Dursun
- DC Carey: Joe Simpson
How to enjoy Satisfied Valley
Content Valley returns to screens on BBC One and BBC iPlayer at 9pm on Sunday, January 1.
The display will then continue each individual 7 days at the similar time on BBC A single.
Wherever is Happy Valley filmed?
The award-winning drama is set in West Yorkshire in Calder Valley and is also mainly shot in the similar Valley.
Beforehand, Pleased Valley was shot in Calder Valley, Keighley, Huddersfield, Sowerby Bridge and Meltham.
But for the latest time, crews have been spotted at the suburb of Halifax in Boothtown and Hebden Bridge.