Sharpe's Trafalgar? Devil? Leipzig? There are possibilities...
There are a few gaps in the full Sharpe storyline that could be made into good movies and even better books.
For example, Sharpe's Devil. I'd like to see Sharpe and Harper standing in the presence of the Ogre of Europe.
Sharpe at Trafalgar? The one thing I found off in 'Sharpe's Challenge' was Sean Bean playing Sharpe in 1803 and 1817 and not aging a day. They can cast a younger actor to play Sharpe at Trafalgar...
..and what about Flanders? I briefly remember the books referencing Sharpe's service in Flanders, I think, before India. An actor around the age of Daniel Radcliffe can play Sharpe in his youth, even giving a glimpse at Sharpe when he was a rascal on the streets of London, and fleeing the law to join the Army.
And perhaps, last but not least, Sharpe's Retirement. For God's sakes, he's fought in more battles and one of the most costliest wars in Europe for 20 plus years. Let him finally hang up the Baker rifle over his fireplace and enjoy his remaining years in peace.
(another gripe about 'Challenge': Lucille bore Sharpe 2 children.)