Ruby has always dreamed of her senior class trip to Paris and is dead set on capturing original content for her travel YouTube channel while abroad. Bonus? It means she will get to spend more time with her crush/video editor Sean.

After a calm first night, Ruby's best friend Val convinces Ruby and two other girls-including Ruby's ex best friend and current nemesis-to sneak out of the hotel and attend a once-in-a-lifetime party with a sexy new Parisian friend, within the catacombs, the dark uncharted maze of bones beneath the streets of the City of Light.

As the group travels the miles of twisted tunnels, the eternal resting place to countless, anonymous souls, it becomes clear: they're hopelessly lost. The deeper they venture, the darker the secrets revealed about the catacombs become. But Ruby's biggest problem may not be the strange noises coming from those dark narrow halls or the bones of the dead fortifying the walls but instead the people she thought she could trust the most.