The Hollywood detective film genre has consistently proven itself popular with movie-going audiences. The attraction to this type of character and the stories involving detectives actually began on radio with a number of successful detective series radio programs. In the early part of the 20th century, as the motion picture industry began to grow, people began to turn off the radio and fill the movie theaters to view the detective movies that Hollywood was producing.
Detective movies did not always require sound in order to entertainingly portray the mystery that was involved. In fact, silent films played a large part in the detective movies that were released during the 1920s. However, the addition of sound greatly enhanced viewers enjoyment through classic dialogue and sound effects.