The struggle between France and Britain is entering its final stages with Wellington having taken one step over te Pyrenees. Napoleon needs to know where he will take the second and so British officer Richard Sharpe joins Colonel Brand to travel behind enemy lines to blow up a French gunpowder 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 seeks solace in the company of another man...