A group of recent high school grads plans to host a blowout bash in a swimming pool at a local mansion before they go their separate ways, but when a mysterious murderer shows up uninvited, the party spirals into a terrifying fight for their lives. As the victims pile up, the rest of the group struggles to find a way off the grounds before they're added to the death count. James McAvoy and Isla Fisher star in this fast-paced horror flick.

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