The main character was this girl (or young woman, I should say) who may or may not have been a police officer, and she encountered this genius guy. There was this one instant the genius guy wrote all over the walls for a code? There was a lot of race-against-the-time elements, something about a clown, some bombs, and this one part of the manga where he asked her about this sort of cake and she mentioned it was cut weirdly.

I also don't know if this helps, but: There was fanservice and the woman was already married, but every time she and her husband tried to have sex, her work came up and interrupted it.

I think its http://www.mangaupdates.com/series.html?id=1860

Yes it is!
Thank you so much ;u;b