The eighth and final season of Dexter finds Dexter Morgan's (Michael C. Hall) carefully constructed world continuing to fall apart at the seams following the death of Lt. LaGuerta at the hands of Dexter's own sister Debra (Jennifer Carpenter). While Debra languishes from remorse, Dexter meets a psychopathologist who appears to understand the code of ethics that have served as motive for Dexter in his storied alter-ego as a serial killer.