The Detective Captain Is Crazy and Wants to Interrogate Himself

Criminal Investigation, Two Male Protagonists, with Emotional Lines

I would like to read a book similar to "Mystery: Chasing the Light". Unit cases are solved at a fast pace. There are two male protagonists, one with emotional lines, and I like to watch those with sub-plots. It's best to be both strong and weak, not weak and crybaby.

The Protagonist Is a Murderer, No Plot, Very Interesting, Suspenseful Book