Claire Paxton is a rebellious and independent late teen, her outlook on life which is driven largely by the fact that her single mother is a self absorbed alcoholic. Claire is repeating some of her senior year classes at Toronto's Arthur Meighen High School in order to graduate, which she decides to do during the school year rather than waste her precious summer doing it in summer school. She has little motivation to attend classes or graduate. Her school year is affected largely by her encounters with two males with who she ends up spending much of her time. The first is Jim, the thirty-something front man for the funk band, the ElastoCitizens, with who she embarks on a sexual relationship. The second is Henry, a ninth grade student who she used to babysit. Henry is an exceptional student, but is at a stage in his life where he too is starting quietly to rebel against his straight-laced upbringing. Claire acts as his mentor in his coming of age, which may change if she knew that ...

Kim and her boyfriend Matt have just broken up, but they travel together to a cottage nearby a lake to spend the weekend with their friends Eve, Dash and his wife Amber and Baker and his new girlfriend Lily. The atmosphere becomes heavy with the situation between Kim and Matt, and one of them suggests them to play "Dead Mary". Matt, Eve and Dash summon the evil witch repeating her name three times in front of a mirror with a candle. Along the night, Matt hears weird noises, is killed and returns to life, while part of the group is possessed by the fiend. Without knowing who is possessed, the rest of the group fights to survive.