When Dexter is saddled with an unwanted conspirator, he is forced to make some hard decisions about her fate when Lumen wants in on his killing routine to find the men who abducted and raped her. Meanwhile, Dexter wonders if Rita's death has awakened a darkness inside baby Harrison. Due to Quinn's recent suspension, Debra works the Santa Muerte case alone, leaving Quinn time to enlist an old friend, Stan Liddy to look into Dexter.