It's been 10 years since Hanna, Derrick, Jane, and Pete have seen each other. They met in college but went their separate ways after graduation. Now they've reconnected and have decided to rent a secluded beach house to stay at for a long weekend of catching up. While they're laughing and getting to know each other again, strange things start to happen that make them reconsider their life choices. As they reveal their secrets to each other, something big seems to be going on. What exactly is happening at the beach house? What does it mean for the four friends' lives? Will they make it through the weekend, or will the tides change?