PARK CITY, Utah (AP) — “Before I Fall” begins by telling the audience that you’re watching the last day of its heroine’s life. Yes, 17-year-old Samantha (Zoey Deutch) is about to die. You don’t know when, or where, or how it’ll happen, but after it does, she wakes up again in her bed, sweaty and disoriented, to find that she has to live that same day over again.