You discovered mystery novels at a young age. You began reading one and you were instantly enthralled. You gobbled it down in one long fevered gulp ... and then you went searching for the next.

“If a narrative is going to be as clumsy as that, can’t it have some guns?” 

There are many reasons we might pick up a detective novel. One is obvious and very simple:
We know we enjoyed the last one.

Roland Barthes proposes an erotics of reading. And crime fiction does not come off well.