Ep 8. Road Kill

In season 4 episode 8 of Dexter, entitled "Road Kill," Dexter becomes fixated on a new potential victim, Boyd Fowler, following a suspicious encounter with him on the roadside. With the Miami Metro Police Department distracted by the recent death of one of their own, Dexter takes it upon himself to investigate Boyd and uncover any criminal activity he may be involved in.

As Dexter continues to tail Boyd, he begins to uncover a series of gruesome murders committed by him, and struggles with whether or not to turn him in to the police or take matters into his own hands. Meanwhile, Dexter's personal life becomes further complicated when his sister Deb begins to suspect that her boyfriend Anton may be involved in illegal activity.

As the episode progresses, Dexter finds himself increasingly drawn to Boyd and becomes desperate to bring him to justice, even at the risk of being caught by the police. Along the way, he must also grapple with his own conflicted feelings about the nature of justice and whether or not his own actions are truly justified.

Overall, "Road Kill" is a tense and gripping episode that delves deep into the complex psychology of its main character, while also keeping viewers on the edge of their seats with its thrilling and suspenseful plot.