The Adventure of the Half-Melted Wolf

Why would a wealthy noble murder a man too poor to own stockings? Inspectors Gregson and Lestrade could explain, but Gregson is suddenly in the custody of the Foreign Office, and Lestrade has vanished. The only clues Sherlock Holmes can use are in the dead man's rags...or a strange archaeological relic involving all three men: A half-melted Celtic wolf found in the bottom of a Roman Well.