As an author of crime fiction, you can follow one of at least two paths :
In the Tana French-manner, you can attempt innovation of the old whodunit-genre, over a century old by now and containing a number of more or less unavoidable items.
Or, like Viveca Sten, you can sing the same old song for the gazillionth time, reducing your personal input to choosing the names of your characters (which you then have reappear in book after book, so choose them wisely). I may be exaggerating a tiny little bit, but you get my drift.
I know which I prefer, and I reckon you know too, by now.