Sir James Damery comes to see Holmes and Watson about his illustrious client's problem. General de Merville's young daughter Violet has fallen in love with the roguish and sadistic Austrian Baron Adelbert Gruner, who Damery and Holmes are convinced is a shameless philanderer and a murderer. The victim was his last wife, of whose murder he was acquitted owing to a legal technicality and a witness's untimely death. She met her end in the Splügen Pass. Holmes also finds out that the Baron has expensive tastes and is a collector and a recognised authority on Chinese pottery.