Fictional detectives don’t fundamentally change over the course of a story. They may hone a skill, become savvier, gain experience, but their personalities remains intact. They may undergo an experience that requires transformation, permitting them to overcome personal flaws or weaknesses. Conversely, such an experience may weaken or challenge them, making them vulnerable in a new way. But what draws readers to appreciate fictional detectives and to care for them and their success in the course of the story, even over the course of a series, remains consistent.