Younger brother of Sherlock Holmes, works as a private investigator and practices fencing. Initially bitter about living in his brother's shadow, he takes on a case to prove himself. He protects music hall singer Jenny Hill, uncovers a blackmail plot involving Lord Redcliff and Eduardo Gambetti, and outsmarts Professor Moriarty during an opera heist, ultimately winning Jenny's heart and earning recognition.
Sigerson is the younger brother of Sherlock Holmes, with Watson serving as Sherlock's longtime companion.
Sigerson acts as Jenny's physical protector during her dangerous music hall career.
Moriarty and Sigerson are direct adversaries engaged in a life-or-death physical confrontation.