Set in 1932 Los Angeles, Perry Mason will focus on the origin story of famed defense lawyer Perry Mason, based on characters from Erle Stanley Gardner's novels. 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.