'Sharpe's Havoc' is set in the spring of 1809: the French, under Marshal Soult, have just taken Oporto and now effectively control northern Portugal. During the retreat from Oporto Sharpe and his men from the 95th Rifles find themselves cut off from the British army, and must take to the hills. Meanwhile, rumour has it that Sir Arthur Wellesly (the later Duke of Wellington) is coming out to Portugal to take on the French. But Sharpe has more to worry about than the French as he is confronted with a dubious Colonel Christopher, detached from the Foreign Office...
This is a novel in the best Sharpe-tradition, full of action, nothing too complicated in the plot, and easy to read (it took me slightly more than a day of non-stop reading). The final chapters in the hills of northern Portugal when Sharpe exacts his revenge are among the best I've read so far in any Sharpe-novel.
By the way, if you're planning to read the Sharpe-novels chronologically it's good to know that, contrary to what it says on the inside cover pages of the HarperCollins paperbacks, this novel does not come after but BEFORE 'Sharpe's Eagle' (which is set in July 1809 during the Talavera-campaign).
So now it's on to 'Sharpe's Gold'. I do love the smell of a fresh Sharpe-novel in the morning! ;-)