The narrative examines the negotiation and aftermath of the Peace of Nikias, outlining its stipulations for mutual restitution, exceptions for capitulations, guarantees for sacred festivals, and arrangements for prisoners and territorial exchanges. It then traces the refusal of major Peloponnesian allies to accept key clauses, Spartan difficulties in enforcing the treaty at Amphipolis, and the recall of garrisons. Diplomatic strain and unfulfilled provisions prompt Sparta and Athens to form a separate fifty-year defensive alliance, including an Athenian pledge to aid against Helot uprisings. The chapter emphasizes the fragility of negotiated settlements and the practical obstacles to implementing complex treaty terms.