It’s an origin story, and I really enjoyed watching it. Mason is a WWI vet who is working as a PI for another lawyer. Drake is a black cop in the LAPD.
By the end, the lawyer Mason was working for is deceased, Mason has become a lawyer himself in partnership with Della, and Drake quits being a cop to work for Perry as a PI.
That’s where season 2 will start.
I used to watch the old Perry Mason series,but I don’t use HBO , so I don’t watch it. I used to read the novels by Earl Stanley Garner,