After a serial killer imitates the plots of his novels, successful mystery novelist Richard "Rick" Castle gets permission from the Mayor of New York City to tag along with an NYPD homicide investigation team for research purposes.
Alicia has been a good wife to her husband, a former state attorney. After a very humiliating sex and corruption scandal, he is behind bars. She must now provide for her family and returns to work as a litigator in a law firm.
Deputy Police Chief Brenda Johnson runs the Priority Homicide Division of the LAPD with an unorthodox style. Her innate ability to read people and obtain confessions helps her and her team solve the city's toughest, most sensitive cases.