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