'We Have Always Lived in the Castle' ending explained: Who is the killer in the film?

We Have Always Lived in Castle is based on a vel by same name by Shirley Jackson. author h previously written Haunting of Hill House which was also apted in film version. chilling thriller features Alexandra Ddario and Taissa Farmiga in le roles with actor Crispin Glover featuring in a pivotal role. Re below to kw what happens at end of We Have Always Lived in Castle - 

Also re:  100 ending explained: What happened to Clarke and her friends in finale?

Warning: Major Spoilers Ahe

We Have Always Lived in Castle ending 

film follows le character of Merricat played by Taissa Farmiga. She lives with her elder sister Constance played by Alexandra Ddario, who is accused of poisoning her parents but is let go by court of law. two live with ir uncle Julian and always stay inbound ir castle. Only Merricat leaves out of house on every Tuesdays in order to get supplies, but villrs do t let her do so peacefully as y think Constance to be responsible for murder of her parents. 

Im courtesy - Still from 'we have always lived in castle'

Also re: ' Good Place' ending explained: How does Elear help Michael in end?

One of family cousins names Charles makes his way to castle and ends up charming Constance. He, later on, is revealed to be a topic and an abusive person who puts harm on Constance which does t sit well with younger sister. Merricat n sets Charles' room on fire with his belongings being inside. But, Uncle Julian ends up de due to smoke inhalation. 

alrey enthralled villrs rush to castle in order to destroy it and sisters make a run for ir life. When y return back to see ir destroyed house, Merricat promises to poison entire vill and kill m for what y did to ir house. Constance reminds Merricat that this is exactly what she did to her parents, revealing that Merricat was killer of her parents and Constance takes blame to save her younger sister.

Charles, however, returns towards end of film when Merricat beats him to a pulp with a sw globe which les to his death. film ends on a rar inconclusive te where it is t shown wher Constance goes back to live in real world or chooses to stay indoors as she was. 

Also re: 'Baby' season 3 ending explained: What happened to Chiara and Ludo in end?

Also re: 'La La Land' ending explained: Is it a s or happy ending to Emma-Ryan starrer?