All eight episodes of the maritime adventure series based on the novels by C.S. Forester. Full of action, intrigue and romance, Horatio Hornblower (Ioan Gruffudd) battles against the sins of the sea and discovers the true relationship between the French, the English and the Irish. Episodes comprise: 'The Even Chance', 'The Examination for Lieutenant', 'The Duchess and the Devil', 'The Frogs and the Lobsters', 'Mutiny', 'Retribution', 'Loyalty' and 'Duty'.

In 1714 Parliament offer a £20,000 prize for anyone who can provide an accurate means of measuring longitude at sea. John Harrison (Michael Gambon) flies in the face of popular opinion by saying that the stars do not provide the answer, and provides his own solution with the invention of a mechanical clock. However, it takes Harrison forty years to prove his theory, and he is eventually forgotten in the mists of time. Centuries later, Robert Gould (Jeremy Irons) attempts to restore Harrison's reputation by tracking down and repairing the four clocks he originally constructed.