Are you trying to read widely in the crime/mystery fiction genre ? Try finding some short stories, these come in 2 ways.
1. as compilations with multiple authors in the one volume
2. multiple short stories by the one author
Reading a short story by a crime author gives you a sense of how they write, without reading a full fiction novel
ALSO available at some libraries are adult readers, these are designed for adults who are learning english as a second language who have to improve their literacy skills. These readers are often short versions of classic authors in this field eg Raymond Chandler, Lynda La Plante, Arthur Conan Doyle
Louise, Youth Librarian, Manly Library