Created in response to Sherlock Holmes, detective Martin Hewitt is less operatic and more pragmatic.
Sam Spade only appeared in one novel. But he left his mark, with the help of the Hollywood legend who portrayed him.
Trixie Belden wasn't as pretty as her best friend, or a cool as Nancy Drew. But she had a 'mental computer' for solving mysteries and a non-judgmental moral core.
A new batch of female crime writers are bringing their real life experiences of law enforcement to their work in a way that rings true for readers.
Food is an increasingly popular ingredient in crime fiction, serving up insights into the character of the detective hero and adding spice to the mystery.