It's Naoki Urasawa's work, he's really good at building a great story that goes places, usually mysteries, but they're not the type of detective fiction like in Conan. Monster (I'm in ep50 atm) is like a perfected version of Master Keaton, so check that out, Inspector Lunge is a pretty good detective and there are couple other ones that leave a lasting impact once their story ends. Keaton is episodic while Monster has a storyline (they're after a guy until the very end but it's entertaining nevertheless by how the world is built around them) and then delves onto episodic things that connect to the story and are written alot better with better production values too.
Death Note is similar to Monster but more colorful I guess since it's shounen.
Read the manga version, it's a really great manga, one of my favorites
Keaton is what you get if you mix Sherlock Holmes, Indiana Jones, Bruce Lee and McGyver
but he's really kind and laidback, he has a passion for archeology and dreams to one day discover the origins of European civilization. He works as an insurrance investigator but almost always end up in dangerous situations and solving mysteries.
He actually acts a lot like Columbo. Though he is genuinely friendly, people tend to underestimate him. But he is actually extremely smart and is a former SAS soldier, so one would be wise not having him as an ennemy
you learn lots of things on history and science while reading it