Happy Valley viewers have all been left with one issue that was never solved in the nail-biting series finale.
BBC One viewers tuned into the gripping grande finale as watched Sergeant Catherine Cawood take on her final mission, which saw her have one last showdown with dangerous crook, Tommy Lee Royce.
And throughout the this series of the hit drama, eagle-eyed were speculating as to why PE teacher Rob Hepworth's daughter Poppy never removed her coat throughout the entire series - a theme which has since prompted several different fan theories.
Poppy was seen donning her coat in every single scene in series three, even while she was eating, relaxing at home, and watching TV with her dad.
Throughout the episodes, it wasn't just viewers who noticed the strange habit, as the characters also made reference to Poppy's outwear.
Pharmacist Faisal Bhatti’s daughter mentions it as well as Rob himself when he ordered the little girl to 'take off that coat' while they were in the house.
Curious viewers were waiting with bated breath to discover why Poppy never took off her coat, but sadly, as the credits rolled following the finale, their questions were left unanswered.
Poppy was not seen on screen again and no reference to the coat was made during the explosive episode leading many fans to discuss theories online.
One curious Happy Valley viewer tweeted: "Unanswered questions I need from Happy Valley - Why was Poppy always wearing her coat?"
"Why Poppy would not take her coat off? and why didn't they explain this?" another echoed.
"I literally won't be able to sleep tonight guessing why Poppy never took off her coat!!!! I need answers omg," someone else quipped.
"I think it might have been something to do with the actress. Maybe she felt more comfortable wearing it and they just let her wear it all the time? And made reference to it in the show because they knew we'd all be wondering? Just a guess," another fan suggested.
While someone else shared: "I think it adds to the mystery. It's so random but so effective and powerful. I'll guess we'll never know."
It comes as Happy Valley fans are praying the show will return for a fourth season, despite producers previously declaring Sunday night's finale was the very last episode.
BBC viewers say they have still more unanswered questions following the crime drama's nail-biting conclusion, which saw Catherine (Sarah Lancashire) come out alive during her final showdown with Tommy Lee Royce.
