When a couple decide to spend their summer vacation in a small town on the coast of Portugal, they had no idea that they would be faced with a dark mystery that would lead to seduction and betrayal. Mar is a dramatic love story and thriller set in the beautiful coastal town of Peniche Portugal. It's main characters Xavier (Lourenço Seruya) and Eduardo (João Santos Silva) visit a childhood friend Cristóvão (Diogo Tavares) who carries a dark secret that only his mother (Sylvie Rocha) knows. Sexual tensions rise until the shocking secret is revealed but only after someone's fate is sealed.