There's Something Wrong with the Children (2023)

Margaret and Ben take a weekend trip with longtime friends Ellie and Thomas and their two young children, Lucy and Spencer. They stay at a campsite. The next morning, they hike through the woods and come across an old building with a cave. Lucy and Spencer are drawn to a well in the cave, seeing a green light that none of the adults seem to notice.

They return to camp and Margaret offers to watch the kids while Ellie and Thomas go on a romantic date. The children express a strong desire to return to the cave, but Margaret and Ben do not allow them to leave. The following morning, Lucy and Spencer have gone missing. Ben rushes to the cave and discovers Lucy and Spencer standing at the edge of the well before falling into it and presumably dying. Panicked, Ben returns to camp to warn the others, but discovers Lucy and Spencer running around, completely unscathed.

During lunchtime, the children act maliciously around Ben, appearing to give him bug-infested snacks and putting pills in Thomas' drink. It is revealed that Ben is taking mood stabilizers, which causes tensions to rise within the group. Ellie and Thomas accuse Ben and Margaret of being irresponsible adults to the children, much to Ben's anger as he points out their bad parenting.

Later, Spencer hits Ben with a shovel. In the struggle, Ben accidentally hits Spencer, seemingly killing him. Ellie and Thomas are overcome with grief and Lucy points at Ben, making them blame him. Ben takes Margaret to the well, convinced that the children are not who they seem, but is unable to find the bodies. Thomas is led into the woods by Lucy. Margaret realizes that Ben was telling the truth when she finds Ellie severely injured. Ellie succumbs to her wounds.

Margaret hides in the campsite. Ben is overpowered by the green light the children saw earlier. It appears he threw himself into the well like the children when he later walks into the cabin and tells Margaret that the children were right about the "shine" (the green light). He attacks Margaret when she says she does not want to become "one of them." She flees but is dragged to the cave by the children.

Margaret witnesses the children dumping Ellie's body into the pit. While they are distracted, she pushes the kids into the pit and flees. Ben tries to attack her. Thomas tackles Ben, sacrificing his life in the process. Margaret grabs the car and leaves. The children and Ben appear in the road and hold hands. Margaret slams on the gas pedal and aims her car straight at the group.