Colonel Valentine Walter
From The Arthur Conan Doyle Encyclopedia

Fictional character.
In the Sherlock Holmes stories
- Colonel Valentine Walter was Sir James Walter's younger brother (BRUC 201).
- He was the thief. Though he didn't killed Cadogan West, he took impressions of the keys, conspired via agony-column ads, stole the plans, brought them to Hugo Oberstein, participated in the cover-up by loading West's body onto a carriage roof, and attempted to profit (BRUC 823)
