Original crime novels often have a fresh take on the detective character. Instead of the traditional tough - as - nails detective, it could be a reclusive librarian or a child prodigy. The way the mystery is presented also matters. If it's told in a non - linear way, like jumping between different time periods in a way that adds to the intrigue rather than confuses, that can make it very original. The use of language too. If it has a distinct voice, like using very poetic language to describe a gritty crime scene, that's original. Take 'The Name of the Rose' by Umberto Eco. It's set in a medieval monastery, has a very intellectual detective, and the language is rich and complex, making it a highly original crime novel.
A unique setting can make a crime novel original. For example, if it's set in an unusual location like a remote island with its own strange customs. Also, an unexpected killer or a motive that is not the typical revenge or greed can set a crime novel apart. For instance, if the motive is related to a complex philosophical idea.
The plot structure can be a big factor in making a crime novel original. Some novels use multiple interwoven storylines that all converge at the end in a surprising way. For example, a crime novel might have a storyline about a missing person, another about a political conspiracy, and a third about a family feud, and they all end up being related. The exploration of themes not commonly associated with crime novels can also make it stand out. Such as exploring the concept of identity in a crime - solving context. Or having a crime novel that focuses on the psychological after - effects of a crime on the community rather than just on solving the crime itself.