Who is the typical reader of my marine mystery crime novels?

Trying to pin down the typical reader of my marine mystery crime novels is a bit like trying to catch the wind. But marketing (as I should know having worked in it for years) is about defining your key markets and then offering them something that they can identify with, something that they need or rather want (even if they don't need it). Easily said but not so easily achieved. Firstly, my crime novels will appeal to lovers of crime fiction. So far so good but crime fiction is such a broad genre that what one person will love in a crime novel another will hate. Crime fiction ranges from the cozy to the hard-boiled, from contemporary to historical, from private eye to police procedural and all sorts in between. And where do my novels slot into this? Well they are certainly not hard-boiled and gruesome - I can't read that sort of book myself let alone write it. OK, so there are gory bits in them, dead bodies and autopsies, but then they are crime no...