His Last Bow by Sir Arthur Conan Doyle

The disappearance of a German spy and the gathering storm that foretells the prelude to World War I is what greets you in this riveting book. The further you read the more mysteries unfold like secret submarine plans with some pages missing found in the hands of a corpse. There's also family insanity in Cornwall, a dead Spaniard and mafia hiding in an empty London flat. His Last Bow was published in the Strand Magazine circa 1908 and included several other short stories as well. Even during Sir Arthur Conan Doyle's own lifetime, Holmes had acquired cult status. His deductive methods, brilliant powers of observation, eccentric habits, occasional dabbling in drugs, strange and exotic clients and his connections among the high and mighty across many countries and continents went on to attain legendary fame. In His Last Bow, Holmes tackles themes like adultery (in The Adventure of the Cardboard Box) which resulted in this particular story being left out of American editions. Holmes' enigmatic and secretive brother Mycroft makes a rare appearance in The Adventure of the Bruce-Partington Plans and Holmes famously remarks, “.....

http://www.loyalbooks.com/book/his-last-bow-by-sir-arthur-conan-doyle