On a bitterly cold winter afternoon, António and Jota return from the front with their friends in search of some ancient Roman baths. They joke around and wade through marshes, reminiscing about their last battle. The baths have emerged after being submerged for a long time beneath a reservoir, and people of all ages come to spend the day there. But there's something mysterious about these baths, as if the water influences the boys' moods, giving them the courage to say things they've never told anyone. As day turns to night, they confess their feelings and their fears of losing their best friend forever.