A young boy named Glen discovers a mysterious geode in his backyard after a tree is removed. Intrigued, he and his friend Terry open the geode, inadvertently releasing dark forces. Strange occurrences begin as a result, including eerie dreams and unexplained phenomena that escalate over time. Glen's older sister, Al, plans a party while their parents are away, which leaves the kids unsupervised at a critical time. The trio realizes that by opening the geode, they have activated a gate to another dimension. Unusual events soon disrupt their lives, characterized by strange infestations and eerie noises that hint at a growing danger.

As their house becomes a focal point for these dark forces, Glen, Terry, and Al find themselves combating increasingly bizarre and terrifying occurrences. They discover ancient texts and clues that suggest a ritual must be performed to close the gate and prevent the creatures from breaking through completely. Paranoia and fear set in, but they must rely on their combined wits and courage to address the escalating horror. With limited time and resources, they struggle to undo the chaos they have unleashed, leading to a confrontation that tests their resolve and unity.