Trama

Trying to uncover why someone was killed on his boat, Dexter must out-maneuver a vengeful Isaak. New leads are brought to light on the Wayne Randall case by Hannah McKay, Randall's alluring former accomplice Dexter discovers has a secret.

Isaak Sirko seeks revenge against Dexter for Viktor Baskov's death. Meanwhile, LaGuerta tells Debra of her suspicions that the Bay Harbor Butcher is alive, and asks for Debra's help with the case. Hannah McKay leads the police to the bodies of a couple killed by Wayne Randall, but Dexter realizes one of them was murdered by Hannah herself. Isaak is arrested and jailed after Dexter lures him into a shoot-out at a rival Colombian bar.

Open with Dexter cleaning his boat while listening to some advice from Harry. Harry doesn't think Debra will be able to handle who he is long-term. Dexter finds traces of a lot of blood.

Masuka has learned Maria processed a blood slide at a private lab and is freaked-out it means he's going to get fired. Debra asks Maria, who tells her she thinks it's possible the Bay Harbor Butcher is still alive. Lundy's notes indicate that he doubted Doakes was the real killer. Maria brings her into her secret, your eyes-only investigation.

Debra gets into the elevator and begins to panic.

Dexter learns that Louis was the one killed on his boat. Seconds later Debra tells Dexter about the slide with Travis' blood. Maria wants them to speak with everyone who has gone missing since Doakes died and fits the profile of a BHB victim. Dexter points her three people that he took care of. Only one of them, Phillip Barnes, has family in Miami, so Debra will make sure she gets his name. Dexter tells her Barnes was a wedding photographer who would find and kill single female guests. Debra is upset that Dexter grabbed him at a reception, meaning it's possible he was photographed.

Dexter comes home and sees his curtains are open. We see that Isaak is waiting for him with gun drawn. Dexter goes to his car and calls his machine, pretending to be somebody confirming an appointment with Dexter. Isaak hears this and heads out. Dexter sees him walk out and recognizes him from the strip club. Dexter calls Isaak and they establish where each other is coming from. Isaak tells him the plan is to take care of both Dexter and Debra.

Dexter meets with Debra and tells him about Isaak and the potential for danger because he killed Viktor. Debra is furious that Dexter found Viktor's fingerprint at the scene of Anderson's death and didn't tell the police. She wants to arrest Isaak, but he tells her that they can't afford Isaak talking. Dexter's plan is for them to go to a hotel and take special precautions when leaving the station. She makes him promise to never take a case from the department again, but doesn't trust his answer.

While watching the strip club Dexter realizes that Isaak is a boss. Angel calls him with word that Hannah is on her way in and plans to talk them through her spree with Randall and how it related to the belongings Randall's mother brought in.

Hannah fills in the blanks for Angel and Dexter, saying they buried bodies near the hotels where they were killed. When Angel leaves the room Dexter notices that Hannah seems more nostalgic than scared as she plays with a toy.

Dexter reads about the feud Isaak's organization is having with the Columbians. In the hotel room Dexter and Debra relive childhood memories from a beach vacation.

Dexter and Angel wait while another Randall victim is dug up. Angel asks him about the bartender who confessed to Anderson's murder. Hannah and Dexter talk about blood.

Maria surprises Debra by meeting her at the Barnes home. Barnes' son tells the women his father used to beat him and his mother, and his life has been better every since Barnes disappeared. He brings them some pictures from the wedding his father had been working when he disappeared. As Maria is looking away, Debra spots Dexter in one of the shots. She suggests they take them to the station and spend more time on the analysis.

The couple Randall killed is dug up. They were kept very well preserved by the shower curtain they were buried in. Dexter begins going through how they were killed out loud, but as he looks at the female victim he realizes she was killed by someone much smaller than Randall. He doesn't say this out loud and glares at Hannah, who looks concerned. When they're alone Hannah asks Dexter why he stopped. Dexter tells her knows her story is a lie, pointing out a scar on her hand. She says the DA gave her immunity from any crime committed with Randall. Dexter spots Isaak nearby.

Dexter makes sure not to lose Isaak as he drives to a bar in a part of town frequented by his Columbian enemies. Dexter walks in, makes reference to Isaak's gang, then sneaks out a bathroom window. Isaak follows a few moments later.

While Debra looks at the wedding photos featuring Dexter, Angel comes in and brings up Anderson's murder. Just then they get a call about a homicide at the Columbian bar. But when they arrive, they find only dead Columbians. All by himself, Isaak was able to kill three people. Isaak was cut and some of his blood is at the scene. Dexter point's out that the blood is that of a fourth person, and not from the three victims. Knowing that it is Isaak's, Dexter reveals his findings of the blood (rather than withholding his findings as he would usually do) at the scene to give Debra and the Miami homicide unit evidence linking Isaak to the murders.

While Isaak is being stitched up at the club, George spots Quinn with Nadia. He tells Isaak that Quinn used to be on the take. In his car Quinn finds a bag of cash on the seat. He sticks it in the glove and drives off. Isaak is brought into the station in cuffs. He and Dexter glare at one another briefly.

Angel tells Debra he doesn't think Alex the bartender killed Anderson. Alex had no connection to Kaja, meaning somebody put him up to it. Debra basically cuts him off, saying that since there is no concrete evidence they can't afford to re-open the investigation. She orders him to "let it go" and he reluctantly agrees.

Dexter and Isaak chat through the prison glass. Dexter asks why it's so important that he kills him. Isaak assures him that he'll get revenge for Viktor, no matter how long it takes. Dexter responds that if Isaak ever finds out who he really is, "you'll regret it."

Debra brings Dexter the photo of him taken at the wedding. He thanks her for saving him. She says that her conversation with Angel made her realize she didn't want to be a part of what he does. They have a beer together and talk about that vacation. Dexter burns the photo and Debra walks away.