The mystery and crime publishing industry has evolved significantly throughout its history. The earliest mystery novels were written in the 19th century, and were often referred to as "whodunit" stories, focusing on the solving of a crime or puzzle.
In the early 20th century, the genre began to diversify with the introduction of new sub-genres such as hard-boiled detective stories and noir fiction. These sub-genres introduced darker, grittier themes, and often featured detectives who were just as flawed as the criminals they were pursuing.
In the 1930s and 1940s, the "Golden Age of Mystery" saw a surge in popularity for the genre, with many classic mystery novels being published during this time. This era was characterized by a focus on cleverly plotted stories, often set in closed communities and featuring amateur detectives.
In the 1960s and 1970s, the genre began to evolve again with the introduction of the police procedural sub-genre, which focused on the investigation of a crime and often featured detectives and other law enforcement officials as main characters.
In recent years, the industry has continued to evolve with the introduction of new sub-genres such as psychological thrillers, and the rise of digital publishing, which has made it easier for new and independent authors to self-publish and reach readers. The industry also has seen an increase in the number of international crime fiction, featuring crime and detective stories from different countries and cultures.
Overall, the mystery and crime publishing industry has undergone significant changes throughout its history, with new sub-genres and technologies continuing to shape the industry. As technology and readers preferences change, the industry is likely to continue to evolve, offering new and exciting opportunities for both writers and readers.