In the film Insidious: Chapter 3, Elise Rainier is a psychic, one of those people who have the quality of seeing things that others do not see. You can even get in touch with the dead, although that is not something simple for her because the psychic wear is brutal.
Elise comes to a young woman who knows her qualities to ask for help. At first Elise rejects her, but ultimately decides to help her. This young woman has a problem with a supernatural presence, which has proposed to disturb her and apparently wants to kill her.
Elise soon realizes that the thing is serious and that the young woman is in real danger. He begins to investigate and realizes that the only way to save her is to get in touch with the world of the dead.
Thus, he will have to contact the deceased to save the young woman, something that will not come out “free” and that will have consequences.