Perry Mason: Official Trailer | HBO
This 2020 version of Perry Mason bears no resemblance to the original. If case you don't know, Perry Mason as a character has been kicking around since 1933. I know him from the popular TV (television) show that ran from 1957 to 1966. Those shows are available on YouTube.
Perry Mason Opening & Closing Theme
In this current show Perry is a PI (Private Investigator), not an attorney like in the books and TV shows. Why the big change? I suspect it's because the writers had a good story and they needed a name for their lead character and picked Perry Mason because they liked the TV show. I dunno. They seem completely unrelated.
Regardless, it's a good show. It's set in 1931 in Los Angles. One of the first settings is the Angels Flight inclined railway that showed up in a Bosch episode. It's a very complicated show with all kinds of emotional entanglements. Some of those are what you expect in a crime show, but some are not.
We have a bit of history in Tatiana Maslany as Sister Alice McKeegan, a stand in for the real Aimee Semple McPherson, an evangelical preacher who pioneered the use of radio to reach a broader audience.
Update March 2021 corrected the number of episodes because everybody has a different screen layout.