RpNation

detective shows-
with-
mystery-

Yes, mate, it might come off as a surprise to you, but genres exist! Shocking revelation!

but
isn't the point of a detective
to solve
mysteries?

Yeah, if ya have a detective and the detective is a central character, the genre is pretty much always mystery. I struggle to even think of one that isn’t...

Sometimes it's listed as sci-fi first, like Asimov's robot novels.

Detective and mystery are completely different genres, especially in film. Just as having a CIA like unnatural superenhancement doesn't make one a sci-fi