An amusement park mogul offers a random group of diverse people $1 million to spend the night in a decrepit former mental institution.

Eight years have passed since Sara Wolfe and Eddie Baker escaped the House on Haunted Hill. Now the kidnapped Ariel, Sara's sister, goes inside the house with a group of treasure hunters to find the statue of Baphomet, worth millions and believed to be the cause of the House's evil.