Sherlock Holmes' Secret Code

Dz Gxhk Rhsblu

Dxxs dx hs dngunfws jugxk swx
ykngfx lu Yhvxk Bskxxs hug yx
kxhgz sl phspw swx djkgxkxk

Swx blmjsnlu kxhmmz rhb
xmxdxushkz dz gxhk Rhsblu

Zljk oknxug
Wlmdxb

Sherlock Holmes, the famous detective, has been working on a particularly difficult case. He has sent an important note (shown above) to his helper, the good Doctor Watson.

Unfortunately the message has been written in a secret code and Watson, being a bit forgetful, cannot remember how to decode it!

Can you decode the message and help Watson to save the day?

This puzzle is also available as a print-out using PDF files.

The puzzle can be found here [PDF file 174 kB]

The solution can be found here [PDF file 101 kB]