Synopsis 50 would like feedback on the following revision.
After her mom's death, seventeen-year-old MAGGIE hopes to forge a new life with her grandma, JESSIE-BELLE, in the small, southern town of Leviathan. But not long after Maggie steps off the bus, DANNY, the son of a local preacher, tells her to go back to California before it's too late.
Jessie-Belle warns Maggie to stay away from Danny. She explains that he is the prime suspect in his father's murder and may be involved in the disappearance of several local teens. But after visiting a disturbing museum of human oddities run by ELIAS LAVENDER, Maggie decides Elias is a more likely suspect.
When school starts, Maggie gets lost during a class trip to the Great Dismal Swamp. She finds a girl impaled on the branches of a tree and shouts for help. Danny appears, seemingly from nowhere. He claims the girl is the victim of a monster that feeds on human sin. They free the girl and take her to the hospital, but she dies.
Maggie returns home to find her grandma disappearing into the swamp, trailed by Elias. Maggie follows. She loses track of Elias, but sees Jessie-Belle summon a Lovecraftian creature from Lake Drummond.
When Maggie confronts her grandma, Jessie-Belle reveals that Maggie is the monster's daughter and his intended bride. She encourages Maggie to submit to the monster, claiming he will grant them both immortality. She also admits to killing Danny's father.
Maggie goes to Danny, hoping he can help her defeat the monster. Danny explains that his family has rescued people from the monster for generations, aided by a supernatural ability to sense human sin, but it can only be killed by one of its own children.
Maggie and Danny resolve to face the beast together. They gather a variety of weapons and force Jessie-Belle to lead them to the monster. But their plan to ambush the beast is derailed when Elias arrives carrying an unconscious girl. Elias hopes to supplant Jessie-Belle as the monster's servant by offering it a worthier bride.
The monster awakens and in the ensuing chaos, Jessie-Belle kills Elias and chops off one of Danny's arms. She declares her unwavering love for the monster, but it kills her.
Forced to face the monster alone, Maggie sets the creature on fire, but is burned herself when the creature falls on her in its death throes.
Several weeks later, Maggie awakens in the hospital where she is reunited with Danny. Danny assures her the monster is dead, and the two embrace, ready to begin a new life together.