Once, when he returned home after months away, he found a little girl on the river wall, clutching a bright blue hat and looking lost. Mateo sat beside her, smelled the river, and for the first time understood how a single garment could be a bridge between people. He gave the girl a tangerine and told her about a red top that made the river kinder. Before she left, she turned and, without thinking, pressed a small coin into his palm: the same warm metal, passed on.