The twentieth Sharpe book contains everything fans of the series have come to expect from Cornwell. Set in 1810, the story finds the British Army executing a strategic retreat from the overconfident French forces in Spain. Lord Wellington has ordered the land stripped of all food so that the massive French army will overextend itself and face severe logistical problems when it does finally engage the British. Sharpe is by now the Captain of the South Essex's Light Company but finds his leadership being challenged by the new presence of eager-beaver Lt. Slingsby, who has been placed there by the South Essex's commander, Col. Lawford (who happens to be his brother in-law).
Early on, Sharpe is out patrolling, and stumbles across some Portuguese and a cache of foodstuffs at a signaling tower. He destroys the supplies, per his standing orders, but not before getting into a vicious fight with the hulking Portuguese owner of the goods. This bruiser is Ferragus, an ex-pirate, ex-slaver, and all-around successful gangster whose brother happens to be a Major of Intelligence for the Portuguese Army. These two brothers fulfill the roles of Sharpe's arch-enemies for the story, while Slingsby and Col. Lawford form the usual army irritants. Following Sharpe's initial victory, Ferragus vows to get even, and finds his chance in the chaos that results when the British pull out of Coimbra just before the French get there. Sharpe, Sgt. Harper, old pal Jorge Vicente (from Sharpe's Havoc) find themselves trapped in the city, along with a beautiful English governess. The middle portion of the book is taken up with their adventures, as they evade their Portuguese foes and the French army. Lots of derring-do, trickery, and the usual bravery and close-quarters fighting. This leads to the final third of the book, in which Sharpe's little band escapes the city and races to reach the British army lines before both Ferragus and the French.
Meanwhile, Cornwell provides small glimpses into the activities of the British Army, which entrenches itself in a 40km-long chain of forts. Called the "Lines of Torres Vedras", they were built at great expense, and yet the French are completely unaware of them. Col. Lawford rather inadvisably orders Slingsby to place the Light Company as a picket on a farm below the forts, and ultimately all forces converge there: Sharpe and company, his Portuguese nemeses, and the lead elements of Marshall Massena's army. What follows is vintage Cornwell, as he simultaneously describes the large-scale fight of the Battle of Busaco, as well as the small-scale defense of the farm by the vastly outnumbered Light Company. It's great stuff, and the only regret is that after such rousing set pieces, and the meting out of just desserts, the book ends all too quickly.