Sharpe is stranded behind enemy lines, but he has Patrick Harper, he has his riflemen, and he has the assistance of a young, idealistic Portuguese officer. Together, they have to find the missing girl and extricate themselves from the entanglements cast by Colonel Christopher, a mysterious Englishman who has his own ideas on how the French can be ejected from Portugal. Those ideas are as fantastic as they are dangerous, but the French are rampant, Lisbon is threatened, and Christopher sees Sharpe and his riflemen as the only obstacles to his subtle scheme.
But there is a newly arrived British commander in Lisbon, Sir Arthur Wellesley, and just when Sharpe and his men seem doomed, Sir Arthur mounts his own counter-attack, an operation that will send the French army reeling back into the northern mountains. Sharpe becomes a hunter instead of the hunted and he will exercise a dreadful revenge on the men who double-crossed him.
Sharpe's Havoc is a classic Sharpe story, a return to Portugal in the company of Sergeant Patrick Harper, Captain Hogan, and Sharpe's beloved Greenjackets.