The actual murderer of Drebber and Stangerson, disguised initially as a cab driver. Confesses to Holmes, revealing his motive was revenge for his fiancé Lucy, who died after being kidnapped and forced into marriage by the victims. Shows no remorse for his crimes.
Core narrative dynamic where Holmes identifies and apprehends the killer.
Hope seeks lethal retribution against Drebber for past crimes against his fiancée.
Hope targets Stangerson as a co-perpetrator in the tragedy that destroyed his life.
Lestrade's investigative efforts inadvertently intersect with the true killer's movements.