Season 7 premiere. After witnessing her brother kill, Debra attempts to reconcile with Dexter while struggling to cover up their involvement with the murder.
When a local convict claims he has new information regarding a 15-year-old crime spree, Miami Metro sets out to unearth new evidence on the case. Debra attempts to cure Dexter of his killer tendencies.
Dexter tries to bring Debra on board with his new target. LaGuerta, convinced the Bay Harbor Butcher is still out there, attempts to enlist Batista to help her re-open the case.
After capturing a deadly killer, things go awry for Miami Metro, sending Debra into a tailspin. In an effort to help his sister, Dexter enters into a dangerous game of cat and mouse, while the Ukrainian mob continues to seek revenge.
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.
Debra gets to know a local crime writer who's dug up some incriminating dirt on Hannah McKay - Dexter's newest obsession. Quinn gets an offer he tries to refuse and LaGuerta keeps digging into the Bay Harbor Butcher case.
Things heat up as Dexter and Hannah grow closer, but when Sal Price discovers the two are involved, he wants the exclusive story. Quinn falls back into his old ways as he makes some questionable choices to protect Nadia.
Dexter tries to keep Debra in the dark about his relationship with Hannah, but a surprise visit from Astor, Cody and Harrison throws a wrench into his plans. Fresh out of jail, Isaak renews his pursuit of Dexter.
Dexter, preoccupied with Isaak, gains an advantage thanks to an internal struggle within the Koshka brotherhood. Miami Metro is on the hunt for an arsonist and Dexter goes to great lengths to protect his relationship with Hannah.
Surprise visit from Hannah's father puts Dexter on alert. Phantom Arsonist's crimes become more gruesome. Defending Nadia's honor forces Quinn into a dangerous situation. LaGuerta brings Matthews to help with the Bay Harbor Butcher case.
As Christmas approaches, Dexter tries to balance his life with Hannah and his relationship with Debra. Dexter learns the man responsible for ordering his mother's death has been released from jail.
