Main Characters
Incidental Characters
- Mr Warren
- Morton and Waylight
- Inspector Gregson
- Mr Leverton of Pinkerton’s American Agency
- Tito Castalotte
- 221b Baker Street, London
- Tottenham Court Road
- Hampstead Heath
- Great Orme Street
- Howe Street
- Bloomsbury
- Posillipo, Near Naples
- Bari
- Bowery, New York
- Brooklyn, New York
- Covent Garden
Messages and Rituals
- Notes left by Emilia Lucca for Mrs Warren
- Advertisements in the Daily Gazette
- Messages flashed by candlelight by Gennaro Lucca
- Messages flashed by candlelight by Sherlock Holmes
Disguises and Deceptions
Sayings
Character Illustrations
Deductions
Additional Information