Jim Evers is a workaholic real estate agent whose continuous pursuit for new deals leaves very little time with his family. He misses his wedding anniversary with his wife Sara, but to make amends, suggesting going on vacation to a nearby lake. Beforehand, Sara is contacted by the occupants of Gracey Manor, located in the Louisiana bayou. Eager to make a deal, Jim drags Sara and his children Megan and Michael to the mansion. They meet its owner Edward Gracey, his stern butler Ramsley, and other staff members Emma and Ezra. When a storm floods the nearby river, Gracey allows the Evers to stay the night, though everyone save Jim is unhappy with the idea. Ramsley takes Jim down to the library to have a talk with Gracey, but while he waits, Jim gets trapped in a secret passage.