Complete story — includes the ending
Dexter investigates Zach and confirms that he murdered Norma. Vogel wants to teach Harry's Code to Zach, but Dexter is skeptical. Deb helps her boss, Elway, prove his sister's boyfriend is being unfaithful. After being denied the sergeant's position, Quinn zealously investigates Zach. Dexter captures Zach just before he kills his father, not his father's latest mistress as expected. Dexter binds Zach in a kill room. Zach confesses to killing Norma to protect his mother, whose alcoholism stems from his father's marital indiscretions. Zach's noble motives convince Dexter to let Zach go and teach him Harry's Code. Later, while eating dinner at Deb's, Debra and Dexter are drugged by Hannah McKay.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Dexter season 8. HTML formatting and reference markers removed. · Content license