Over the emotional objections of Abigail, John Adam and his son endure turbulent seas and an encounter with the British Navy to join Ben Franklin on a diplomatic mission to Paris. But Ben cannot restrain John's abrasive personality which is even less well suited to Paris than Philadelphia.

Following the surrender of the British, John secures a long sought loan from the Dutch and returns to Paris to oversee the peace treaty. John can no longer bear his absence from Abigail and invites her to Paris which immediately overwhelms her with it's opulence. John is appointed ambassador to England but soon longs to return home to participate in the formation of the new government and, like Abigail, to be reunited with the children. They return home to an overwhelming welcome and John reluctantly returns to public service.

Following the peace treaty with England President Adams struggles to avoid war with France despite pressure from his Federalist cabinet and French provocation. John finds the price of peace to his career and the price of his long career of public service to his family is indeed high.