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Stefanie Scott stars as Quinn in the new chapter of “Insidious.” She’s a teen haunted by the death of her mother and the creepy man who lives in the vents. She will need the help of Elise (Lin Shaye) to conquer her demons, so to speak.

I sat down with the young actress to talk about her interest in making “Insidious: Chapter 3,” how she prepared for her character, and how writer/director Leigh Whannell used air horns to get genuine fright from the cast.