Vincent, a 30-year-old iron bender who lives with Camille and her son, works at night on the construction site of the biggest shopping mall in Europe, Grand Ciel. He hangs onto his new job even if the work is hard and dangerous, because he believes that his family’s future depends on it.
After a night of flooding on the construction site, one of his team mates is missing. Vincent’s colleagues argue that workers often leave without giving notice. When another worker vanishes, Vincent suspects that Lobbo, the team leader, has concealed deadly accidents. He begins to investigate, but when Lobbo disappears in turn, Vincent starts to believe in what some say: Grand Ciel swallows workers on stormy nights.
Soon after he is offered Lobbo’s position, Camille tells him that she is pregnant. But even with this new job, and the promise of stability, Vincent begins to fear being swallowed too.