Set in 1932 Los Angeles, the series focuses on the origin story of famed defense lawyer Perry Mason. Living check-to-check as a low-rent private investigator, Mason is haunted by his wartime experiences in France and suffering the effects of a broken marriage. L.A. is booming while the rest of the country recovers from the Great Depression — but a kidnapping gone very wrong leads to Mason exposing a fractured city as he uncovers the truth of the crime.
Months after the Dodson case has come to an end, the scion of a powerful oil family is brutally murdered. When the DA goes to the city's Hoovervilles to pinpoint the most obvious of suspects, Perry, Della, and Paul find themselves at the center of a case that will uncover far reaching conspiracies and force them to reckon with what it truly means to be guilty.