Happy Valley, created and written by Sally Wainwright, received rave reviews when it returned for a final series on New Year's Day.
The drama follows Sergeant Catherine Cawood (Sarah Lancashire) on the trail of murderer and sex offender Tommy Lee Royce (James Norton).
The first episode aired on January 1 and saw Catherine discover the remains of a gangland murder victim in a drained reservoir. It sparked a chain of events that led her straight back to Tommy Lee Royce.
READ MORE: Carol Vorderman shares her only rule for the five men she's dating
Catherine also had to deal with her grandson Ryan (Rhys Connah), who is now 16, and wanting a relationship with his father. This left Catherine's sister Clare (Siobhan Finneran) caught in the middle.
How many episodes of Happy Valley are there in season 3?
There are six episodes in series three. Each episode is an hour long and airs on Sunday nights at 9pm on BBC One.
When does Happy Valley end?
The last episode of Happy Valley will air on Sunday, February 5.
Will Happy Valley return for a fourth season?
Happy Valley will not air a fourth series. The sixth episode of Happy Valley on February 5 will be the last.
Sally Wainwright, writer, creator and executive producer, explained her decision to make Happy Valley a trilogy and why it took her so long to write. She said: "I waited six years because I wanted to get to a point where Ryan would be old enough to start making choices about whether he wanted to have a relationship with his dad or not.
"And could he have a relationship with his dad, and how would Catherine feel about that? I really wanted to be able to explore that. It’s been great that we got Rhys back to play Ryan which has been fantastic, and he has done a really lovely job in that.
"That was always the intention, to have a gap and it has worked out just about right. Just the right period of time because he is now 16, so he can travel places by himself, he can make choices. He can do things behind Catherine’s back.
"The intention developed through conversations I had with Sarah to make it a three-parter, to make a trilogy. We always said this would be the final season and it is very definitely is the final season."
Receive newsletters with the biggest and breaking TV and showbiz news by signing up here
READ NEXT:
Primark's 'amazing' £38 coat shoppers are saying is identical to North Face's £290 version
Dancing On Ice under fire as feature sparks 'sickened' viewers to switch off
Mum let son, 12, do the Asda big shop and here's what he bought
Martin Lewis says debit cards are now 'danger cards' in new warning
