Castle goes to Los Angeles in hopes of finding answers about the time he cannot remember, but ends up in danger when he is recruited by the Greatest Detective Society.
Dexter continues his close friendship with Miguel Prado, who praises him for taking action and accomplishing what he could not. Dexter is still concerned about his secret getting out and decides to show Miguel that what he does is not pretty. Unfortunately, Miguel takes a far greater interest in Dexter's plans than Dexter could have imagined.
McCord and her staff work to extradite a Mexican cartel leader to a U.S. prison to diminish the opioid crisis. The cartel leader escapes and an urgent search is undertaken.
When an anti-capitalist protester is murdered, Jane and the team investigate and find themselves caught in a war between eco-activists and a tech billionaire fighting over a piece of land; Jane and Capt. Joe go on a date.
Dexter begins to question his blind loyalty to his father's memory. In an act of spontaneity, he wonders whether The Code of Harry is a necessity anymore.