Sophie, a young woman, is celebrating her 18th birthday with a party organized by her friends at her house. Her friends Mona and Beth, among other classmates, attend the celebration, which starts off lively and fun. The event takes a dark turn when an ancient, cursed book that Sophie's mother used to own is opened, unleashing horrific monsters into their world. This sinister tome holds the power to summon various deadly creatures, each one more terrifying than the last. As chaos ensues, guests are picked off one by one by these monstrous entities.

In the midst of the carnage, Sophie must confront the grim history tied to her mother's mysterious past. With her friends' lives in peril, she relies on her courage and quick thinking to find a way to fight back against the supernatural onslaught. Meanwhile, secrets about the book and its dark origins are gradually revealed, depicting a tale of ancient evil that only grows more menacing as time ticks on. The group battles for survival, facing immense challenges that test their limits in an attempt to close the gateway to this nightmare before it's too late.