Final answer:
Modern detective stories differ from classic ones by offering more complex character development and social themes, coupled with varied narrative perspectives.
Step-by-step explanation:
One major difference in modern detective stories today compared to classic detective stories is the approach to character development and narrative complexity. Classic detective stories often adhered to a formulaic structure with a distinct hero, clear-cut moral distinctions, and the primary goal of solving a mystery. Modern detective stories, on the other hand, tend to delve deeper into character psychology, often presenting flawed heroes, ambiguous moral landscapes, and complex social themes that might address contemporary issues like race relations or technology. Additionally, the narrative style can range from first person to an omniscient third person point of view, giving a broader or more intimate perspective into the story's events and character thoughts.