The main character needs to have some sort of character defect, and the cases need to involve things that do not happen every day.
House is a caustic misanthrope, Sherlock is arrogant and anti-social, Monk is obsessive compulsive, Conan Edogawa is a high school kid who got his body de-aged to primary school age via poison.
An over-the-top main antagonist helps, too.

It has to be called Broadchurch

Of Scandinavian origin helps (most of the time).

Ahhhh, Monk. I miss that show.
Along with good character balance, the casting was good.
No story can pull it’s weight if poorly cast.