On the trail of a missing husband, private investigator Goro crosses paths with a deranged killer.
 
(Source: Anime News Network)

Michael Tremain Sinterniklaas is a French-American voice actor, ADR director and script writer who has provided voices for a number of English language versions of Japanese anime films and television series, as well as cartoons and video games. He has worked for Studiopolis, Funimation, 4K Media, Central Park Media, Bandai Entertainment, Viz Media and Media Blasters. He is the founder and owner of NYAV Post, a Bi-coastal studio located in New York City and Los Angeles, which dubbed many different anime titles and recorded several original prelay works.

(Source: Wikipedia)

Manga about detective Nanase Gorou, 25. He works in a private detective agency and solves many complicated cases. Not only criminal ones, but social ones as well. 
 
Note: 
- The chapter count includes 2 non-numbered chapters in volume 24. 
- Includes the one-shot "Mirai-hen: Kanata Yori Ai wo Komete (未来編　彼方より愛をこめて)" 
- Includes the story "Harinezumi Kouyuuroku (ハリネズミ交遊録)", 17 chapters 
- Includes the story "Roppongi Shinjuu (六本木心中)", 2 chapters

Gorou Nanase