HIS LAST BOW, as the title suggests, is Sir Arthur C. Doyle's final book of the reminiscences of Dr Watson on the world's greatest detective.
SHERLOCK HOLMES hasn't lost anything of his powers of deduction and analysis.
Some pearls are to be found here : THE BRUCE PARTINGTON PLANS, in which brother Mycroft appears for the second time (since the case of the Greek interpreter), an amazing crime-story about trains & lost documents.
In the same book you'll find THE DEVIL'S FOOT, a short story that takes place in Cornwall, this time about drugs (the kind that kills people in a few hours).
And finally, HIS LAST BOW, Holmes'contribution to the war effort.