Question: A 1979 period children’s adventure film, directed by a man known for his socially critical directing style and for his socialist ideals, which are evident in his film treatment of social issues, was based off a novel by what author?
Sentence (from "Black Jack (1979 film)"): It is set in Yorkshire in 1750 and follows a young boy, Tolly (Stephen Hirst) and his adventures with a large French man (Jean Franval), the Black Jack of the title, and Belle a young English girl (Louise Cooper).
Relevant evidence: No