Dexter: Season 5, Episode 5

5 - 5: First Blood

When Dexter is saddled with an unwanted conspirator, he is forced to make some hard decisions about her fate; meanwhile, Dexter wonders if Rita's death has awakened a darkness inside Harrison; due to Quinn's recent suspension, Debra works the Santa Muerte case alone, leaving Quinn time to enlist an old friend to look into Dexter.