Given the question: Information:  - Georgette Heyer (16 August 1902  4 July 1974) was an English historical romance and detective fiction novelist. Her writing career began in 1921, when she turned a story for her younger brother into the novel "The Black Moth". In 1925 Heyer married George Ronald Rougier, a mining engineer. The couple spent several years living in Tanganyika Territory and Macedonia before returning to England in 1929. After her novel "These Old Shades" became popular despite its release during the General Strike, Heyer determined that publicity was not necessary for good sales. For the rest of her life, she refused to grant interviews, telling a friend: "My private life concerns no one but myself and my family."  - Simon the Coldheart is a novel by Georgette Heyer  - Detective fiction is a subgenre of crime fiction and mystery fiction in which an investigator or a detectiveeither professional or amateurinvestigates a crime, often murder.  - Historical romance (also historical novel) is a broad category of fiction in which the plot takes place in a setting located in the past. Walter Scott helped popularize this genre in the early 19th-century, with works such as "Rob Roy" and "Ivanhoe". Literary fiction historical romances continue to be published, and a notable recent example is "Wolf Hall" (2009), a multi-award winning novel by English historical novelist Hilary Mantel. It is also a genre of mass-market fiction, which is related to the broader romantic love genre  - The Black Moth (1921) is a Georgian era romance novel by the British author Georgette Heyer, set around 1751. Published when Heyer was nineteen, "The Black Moth" was her debut novel. It was based on a story she had written for her haemophiliac younger brother and published with the encouragement of her father. It was a commercial success. While modern critics have considered it a flawed work, they have observed characteristics Heyer included in her later works.  - These Old Shades (1926) is a Georgian (set around 175556) romance novel written by British novelist Georgette Heyer (19021974). It was an instant success, and established her as a writer. It falls into the category of historical romance.    Given the paragraphs above, decide what entity has the relation 'genre' with 'historical novel'.
The answer is:
simon the coldheart