Death Cloud by Andrew Lane
The year is 1868, and Sherlock Holmes is fourteen. His life is that of a perfectly ordinary army officer's son: boarding school, good manners, a classical education - the backbone of the British Empire. But all that is about to change. With his father suddenly posted to India, and his mother mysteriously `unwell', Sherlock is sent to stay with his eccentric uncle and aunt in their vast house in Hampshire. So begins a summer that leads Sherlock to uncover his first murder, a kidnap, corruption and a brilliantly sinister villain of exquisitely malign intent . . .
Death Cloud is the first in a series of novels in which the iconic detective is reimagined as a brilliant, troubled and engaging teenager - creating unputdownable detective adventures that remain true to the spirit of the original books.