Delta depicts a clash between poachers and fishermen in the Po Delta National Park. Osso (Lo Cascio) wants to protect the river from the irresponsible fishing activities engaged in by the Florian family, who have fled the Danube. Standing alongside the Florian family, we find Elia (Borghi) who was born on these lands. Swept away by blind violence and a thirst for revenge, the two will go head-to-head, discovering who they really are in a duel which boasts no heroes.