Two young men are murdered, each in a carriage with a stiletto through the throat; one in Brussels, one in London. In the latter case the murder weapon, a stiletto stick, indubitably belongs to our young hero, Luke, and he is known to have quarreled with the victim in a club just before. In fact, Luke is protecting his elderly Uncle Radclyffe, a surrogate father to him, who has killed not once but twice (a real newly-discovered heir, and then a fraudster who impersonates the murdered man and blackmails the murderous uncle) in order to protect the inheritance of the only member of the younger generation of the family that Radclyffe cares for - Luke. (Goodreads)
Baroness Emma Orczy (; 23 September 1865 – 12 November 1947), usually known as Baroness Orczy (the name under which she was published) or to her family and friends as Emmuska Orczy, was a Hungarian-born British novelist and playwright. She is best known for her series of novels featuring the Scarlet Pimpernel, the alter ego of Sir Percy Blakeney, a wealthy English fop who turns into a quick-thinking escape artist in order to save French aristocrats from "Madame Guillotine" during the French Revolution, establishing the "hero with a secret identity" in popular culture.