Deb tries to cover up involvement in Travis' murder; Detective Mike Anderson has an unfortunate run-in; Quinn and Batista make amends; LaGuerta rethinks the Bay Harbor Butcher case.
Miami Metro sets out to unearth new evidence on a claim from a local convict that he has new information regarding a 15-year-old crime spree; Debra tries to cure Dexter of his killer tendencies.
Dexter tries to bring Debra on board with his new target; LaGuerta tries to enlist Batista to help her reopen the case of the Bay Harbor Butcher.
After capturing a killer, things go awry for Miami Metro; Dexter begins a dangerous game of cat and mouse, while the Ukrainian mob seeks revenge.
New leads are brought to light in the Wayne Randall killing spree case.
Debra meets with a local crime writer; Quinn gets an offer; LaGuerta continues to dig into the Bay Harbor Butcher case.
Dexter and Hannah grow closer and Sal Price discovers the two are involved; Quinn makes questionable choices to protect Nadia.
Dexter tries to keep Debra unaware of his relationship with Hannah.
Dexter gains an advantage thanks to an internal struggle within the Koshka brotherhood; Miami Metro is on the hunt for an arsonist.
Hannah's father visits; the Phantom Arsonist's crimes become more gruesome; LaGuerta brings in Matthews to help with the Bay Harbor Butcher case.
Christmas approaches and Dexter tries to balance his life with Hannah and his relationship with Debra; Debra follows a potentially incriminating tip.