Bhool Bhulaiyaa (2007) on Netflix

After the passing away of her parents, Radha gets adopted by Badrinarayan Chaturvedi. Her childhood was spent with Badrinarayan's nephew, Siddharth, and the family planned to get them married after they mature. When Siddharth grew up, he re-located to America. When the time came for him to return, Badrinarayan started to make preparations for the wedding, but ended up being surprised when Siddharth is accompanied by his wife, Avni. Due to his ancestry, Siddharth undergoes a formal coronation ceremony and moves into a huge manor. Avni starts exploring the manor and finds out that there is an entire floor that is under lock and key. She gets a key and enters the forbidden floor and unleashes a vengeful entity and a series of incidents. The family suspect Radha to be the perpetrator, prompting Siddharth to summon his seemingly bumbling Pyschiatric pal, Dr. Aditya Shrivastav, to shed some light into this seemingly occult mystery that will soon endanger everyone's lives.