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You can stream Exeter (2015) on Amazon Prime with a subscription.

During an all-night, drug-fueled party at an abandoned asylum known for the horrific treatment of its patients, a group of ordinary teens decide to experiment with the occult, mysteriously leading to a violent possession. In an effort to find help, the group rushes to escape, only to find themselves locked inside with no means of communication. Tempers flare, trusts are broken and in attempt to save one of their friends possessed by the demon, the amateurs try to perform an exorcism. Instead of solving the problem, and unbeknownst to them, they unleash an even more powerful and vengeful spirit, one with a distinct motive and which wants them all dead. The teen's only chance of survival is to uncover the asylum's deep mysteries and find a way out before it's too late.

Can a group of teenagers survive a night of occult rituals when their abandoned asylum playground turns into a literal death trap? Once the doors lock, the line between a drug-fueled party and a supernatural slaughterhouse vanishes completely.

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