Siren (2016)

A mystic and a sheriff investigate a séance in a church that has gone wrong, resulting in the deaths of those who were present during the ceremony. The sheriff is killed by the creature that was summoned, which appears as a young girl. The mystic fastens a shackle around her ankle.

Years later, Jonah goes out with his brother Mac and friends Rand and Elliot for his bachelor's party. They are let down by the first strip club they visit, but a stranger approaches them and brings them to a secret club, whose owner is revealed to be Nyx, the mystic from earlier. He welcomes them and upon hearing that Jonah wants a non-sexual experience, Nyx sends him to a private room.

Jonah sees a captive woman on the other side of a glass window. He tries to talk to her and she begins singing with mermaid's song. Jonah, in a trance, suddenly relives all the sexual encounters he has ever had at once. Fearing that the woman is a sex slave, Jonah and his friends help her escape. She is revealed to be the creature from the earlier scene and transforms into a demonic creature, killing a guard so she can escape. After the friends flee in a car, the woman pursues them, crashes the car, and kidnaps Elliot.

Nyx and his men kidnap Rand and torture him, questioning what his intentions are regarding the creature – Lilith. Jonah and Mac escape to a diner and seek help from some police officers. Jonah quickly discovers that they are working for Nyx, and Lilith tracks them to the diner. She kills everyone inside and flies away with Jonah. In a quarry, Lilith puts Jonah into a trance and makes him visualize Eva, Jonah's fiancée, while Lilith rapes him. When he comes to his senses, Jonah returns to his hotel where Nyx offers a trade of Rand for Lilith.

At the church, Nyx tells Jonah that Lilith is a succubus that he had imprisoned. Nyx tells Jonah that Lilith has bonded with him and that if he is able to put the shackle back on her, that will allow Nyx to control her once again and they will be free to leave. Lilith arrived, kills Nyx and his henchmen, and Lilith releases Jonah with a kiss after Mac is killed.

One year later, Jonah and Eva are celebrating their anniversary. After making love, Jonah goes downstairs and sees Eva asleep on the couch, realizing Lilith used another trance upstairs. In a fit of jealous rage, she attacks Eva, and Jonah says he will go with her if she spares Eva. Lilith grabs Jonah, and they fly off as Eva helplessly watches them disappear into the night.