Ricardo, a middle-class father, and his two daughters are sailing on a remote and beautiful lake in Chile to visit the family's vacation home, which has been neglected for years and is falling apart. While his daughters nap on deck in the mid-day sun, Ricardo sees a group of men on a small boat in apparent distress and calling for help. Paralyzed by his paranoia, he turns his sailboat in the other direction, but his daughters wake up and call him out for his lack of compassion. Ashamed by their criticism, Ricardo returns to assist the men, who come aboard his sailboat. Unfortunately, one of the men is missing and feared drowned, and a tense search ensues, causing an ugly fear to fester between all parties. This leads to a chain of events that cannot be reversed.
