HAPPY DEATH DAY PLOT SUMMARY
Theresa "Tree" Gelbman wakes up on her birthday in the dorm room of classmate Carter Davis after a drunken binge the previous evening. Tree ignores her father's calls, dismisses Carter as she leaves his room, throws away a birthday cupcake given to her by her roommate Lori Spengler, and has an affair with her married professor, Gregory Butler. That night, on her way to a party, Tree is lured into a tunnel and murdered by a hooded figure wearing a mask of the campus mascot.
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