So the MC comes back from a vacation where he was fairly sure a criminal organization was paying off the cops. Then he finds recordings from cameras hidden in their house on a detective's computer and when telling Nina he says that he doesn't think the police did it because they wouldn't do something illegal but the detective who had the recordings is a "suspect?"
I knew the MC is exceptionally stupid but this is just ridiculous. Unless he suffered brain damage when he was taken captive and beaten. That's the only explanation other than bad writing or maybe the MC having a learning disability.
Maybe that's what's so special and mysterious about him? He was born with half a brain but rather than being braindead he's (relatively) normal and functional.
Also, this is one of the dumbest agreements possible.