The struggle between France and Britain is entering its final stages. The Duke of Wellington has taken one step over the Pyrenees. Napoleon needs to know where he will take the second. British officer Richard Sharpe joins Colonel Brand (Mark Strong) travelling behind enemy lines to blow up a French gun powder magazine. Sharpe becomes suspicious of Colonel Brand's loyalty and with the French moving closer, he knows he must risk his own life to confront the enemy. Meanwhile, alone in the camp and frustrated by her husband's absence, Jane (Abigail Cruttenden) seeks solace in the company of another man.