The family consists of a mother, father, and their two young children. They are on vacation in a beach house when a massive storm hits the area, causing flooding all around them. As they try to ride out the storm, they hear strange noises coming from the water.
Soon enough, they realize that a shark has somehow made its way into their rental and is now stalking them from below. The family must use all their wits and resources to defend themselves from the terrifying predator and find a way to escape their flooded home.
As the water levels continue to rise, the family becomes more and more desperate, and tensions rise between them. The father puts himself in harm's way to try and take out the shark, while the mother works to keep the children safe. They must work together to outsmart the shark and find a way to get out of the house before the water rises too high.
Along the way, the family faces even more challenges, such as power outages and lost supplies. Ultimately, they must rely on their own strength and resolve to survive the dangerous circumstances they find themselves in. Will they be able to outlast the shark and the storm and make it out alive? Or will they end up as its next meal?