Season 4 begins with Holmes facing criminal charges in the aftermath of his recent violent behavior and relapse, and his father arriving in New York to fix his estranged son's troubles by any means necessary. Meanwhile, Sherlock and Watson investigate a case in which a woman goes missing and may have been killed by her husband.moreless
While Leslie helps Barbara with counseling, Jim and Harvey try tor rescue Falcone from first Oswald, then Fish, then Maroni. Meanwhile, Kristen asks Edward about Tom's mysterious disappearance.
As Jim and Harvey close in on the Ogre, the killer executes his own plan to get his perfect mate. Meanwhile, Bruce gets to Bunderslaw's safe, and Oswald sets in motion a plan to take control of the Gotham underworld.moreless
While Jim continues his pursuit of the Ogre, Edward comes to Kirstin's defense. Meanwhile, Maroni pays a visit to Oswald's cabin and shares some important truths with Gertrud.
Gerald Crane claims another victim and Jim and Harvey try to track him down. Meanwhile, Bruce insists on going on his yearly hike alone, Fish wakes up in a strange place, and Falcone negotiates with Maroni to keep Oswald alive.moreless
Before leaving Gotham, Fish tips off Maroni to who betrayed her. Meanwhile, Jim and Harvey go after a killer who make his victims face their worst fears, and Essen is forced to suspend Edward.moreless
The GCPD has no choice but to bring Jim in when the new "Electrocutioner" goes on a criminal spree. Meanwhile, Falcone faces a challenge from within when Fish makes her move.
Jim begins his new assignment at Arkham, but a mysterious assault on a prisoner gives him an unexpected case to solve. Meanwhile, Selena takes a sick Ivy to Jim's apartment, Renee begins to fall back into her old addictions due to Barbara, and Oswald gets a harsh lesson.moreless
Jim decides to go out with a bang by arresting Falcone and Mayor James for framing Mario Pepper. However, first he has to survive an attack by Falcone's man Victor Zsasz. Meanwhile, Maroni refuses to hand Oswald over to Falcone and matters escalate between the two dons.moreless
Jim and Harvey investigate a death caused by a new drug, Viper, which has fatal side effects. Meanwhile, Oswald offers to help Maroni raid Falcone's casino, and Fish trains Liza in how to get close to Falcone.moreless
A hit man targets both sides of the city council as the fate of the Arkham district is decided. Jim and Harvey are assigned to find the killer's next target and protect him. Meanwhile, Oswald worms his way into Maroni's good graces, and Fish goes recruiting.moreless
Jim and Harvey track down a vigilante who uses weather balloons to kill his victim, corrupt figures in authority. Meanwhile, Oswald gets close to Carmine's rival for the mobs, and Barbara is told to ask Jim if he killed a man.moreless
In the series finale, Dexter faces impossible odds with The Brain Surgeon on his tale and a vicious hurricane approaching Miami. With no time left, Dexter plans his arrangements for the future.
Dexter, still reeling from Vogel's death, plans to eliminate Oliver Saxon before fleeing the country with Hannah & Harrison. During all of this, the hurricane shuts down the airport and Debra has been shot, leaving Dexter with few options.moreless
Dexter desperately tries to escort Vogel to safety with her increasingly dangerous son on the loose. Meanwhile, Debra learns of Dexter's plans to flee to Argentina with Hannah and Harrison.
Dexter tries to get to the bottom of Zach's murder, whilst at the same time keep Hannah hidden from the US Marshall who has come looking for her. Vogel comes face-to-face with a ghost from her past.
After helping Quinn with some investigative work, Deb toys with the idea of returning to Miami Metro.moreless
Dexter realizes that Zach has killed his neighbor, Cassie, by bludgeoning, and he and Hannah race to the Keys where Zach is located to finish him off. With Hannah still in danger of being caught, she plans for a new identity.moreless
Dexter hunts down Hannah to figure out why she is in Miami. Dexter takes on a protégé and teaches him the code.
Dexter and Quinn both look into Zach Hamilton as a potential murder suspect. Meanwhile, Deb goes undercover in a new case that has personal attachment for Elway.
Dr. Vogel comes into contact with the "Brain Surgeon". Dexter and Deb try to keep her safe. Masuka learns that he has a daughter.
Dexter goes in search of another serial killer from Dr. Vogel list. Quinn passes the seargent exam. Dr. Vogel treats Deb for her PTSD.
Dexter continues the search for the Brain Surgeon. Meanwhile Deb finds help in an unexpected source when her post tramatic stress disorder kicks in.
Miami Metro continues the search for the Brain Surgeon. Dexter finds a clue and attempts to find the Surgeon before his colleagues. Dexter gets a bit closer to Dr. Vogel. Dexter keeps attempting to bridge the gap that has formed between him and Deb. Deb is forced to take matters into her own hands as she tries to find the jewels that Biggs had stolen.moreless
Six Months after LaGuerta's death, Deb has left the police force for private security. Dexter and Deb are barely speaking. A new serial killer dubbed "The Brain Surgeon" is in Miami. Dr. Evelyn Vogel, a psychiatrist known as the "sociopath whisperer" offers her help to Miami Metro. She may hold clues to Dexter's past.moreless
Ryan set out to rescue Claire when Carroll learns where his ex-wife is being kept in protective custody. Meanwhile, Emma and Jacob are reunited, and Ryan turns to an old friend for help.moreless
No one was surprised when the wealthy socialite and drug addict Vivian Bowers was found dead of an overdose, except for FBI agent Will Moreno. He is convinced that the death was a homicide, and that someone in Vivian's family did it. He gets help from Detective Joanna Locasto, who at one point had been Vivian's best friend. When Joanna attends the funeral, the family embraces her, offering her a place to stay. She then begins to undercover secrets about how Vivian died, putting herself in danger.moreless
When LaGuerta arrests Dexter he shows its far from over and he plans to finish what he started with Hector Estrada. With LaGuerta close to proving that Dexter is the Bay Harbor Butcher in front of everyone, Dexter is left no choice but to deal with LaGuerta and close the Bay Harbor Butcher case once and for all.moreless
LaGuerta now believes that Dexter is the Bay Harbor Butcher and sends Matthews to talk to him. Dexter also must find a way to kill the last of his mother's killers when Hector Estrada is released. Dexter also questions Hannah about when Debra mysteriously just blacks out leading to a car accident. Quinn learns that Nadia has skipped town.moreless
When the Phantom arsonist kills again, Dexter moves closer to finding his identity. Dexter explains his dark passenger to Hannah while she is visited by her father who hasn't always been the best father to her. Quinn has a final confrontation with George Novikov who decided to send Nadia to another club. LaGuerta tells Matthews that she thinks Dexter is the Bay Harbor Butcher and they both try to resolve a way to deal with the situation.moreless