Ragnar was in a vulnerable place, physically and emotionally, at the end of last season, where do we find him when Season 4 begins? A large part of this season is about identity and people trying to find out who they are and what they are and what they should be doing.
A small Texas town when a beautiful popular teen, Kate, is abducted and, seemingly unrelated, a girl, Jeanette, goes from being a sweet, awkward outlier to the most popular girl in town and, by '95, the most despised person in America.
Lucifer Morningstar has decided he's had enough of being the dutiful servant in Hell and decides to spend some time on Earth to better understand humanity. He settles in Los Angeles - the City of Angels.
In 1990s Boston, an assistant district attorney and a corrupt yet venerated FBI veteran work together to take on a case that grows to involve, and ultimately subvert, the entire criminal justice system of Boston.