Two teenage couples traveling across the backwoods of Texas searching for urban legends of serial killers end up as prisoners of a bizarre and sadistic backwater family of serial killers.

The whole gang are back and as close as ever. They decide to get even closer by spending the summer together at a beach house. They decide to hold the biggest party ever to be seen, even if the preparation doesn’t always go to plan. Especially when Stifler, Finch and Jim become more close to each other than they ever want to be and when Jim mistakes super glue for lubricant…