Brilliant film! A "Hitchcokian" thriller with all the trimmings. Extreme wealth controlled by Dina Cotton, a strong-willed and very unlikable matriarch surrounded by three greedy, ungrateful adult children: Gill, Harold, and Iona. Yes, it is a family setting.
Tired of their mother's stranglehold on their inheritances, the children look for someone to "Gaslight" their mother. Maggie, a former military special opps soldier, reluctantly accepts the work in order to help her foster mother who is struggling.
The story culminates on the night of Dina's birthday party. That's when all hell breaks loose. These evil children have designed a Machiavellian plot that forces Maggie into hiding.
The chase begins and there is twist upon twist. As a family drama, you will wonder if this is about nature versus nurture. Like any great thriller, you will see that the ending is truly ironic. This is where nurture and nature work together for justice in a cold and cruel world. Excellent ending.