Dexter attends his high school reunion; a faith-based murder causes Dexter to question spirituality; Deb becomes an unexpected hero.
Homicide brings in a minister with a criminal past; Debra is surprised by two proposals.
A serial killer from Dexter's past reappears; Debra struggles in her new job; Travis works to keep Gellar happy.
Harrison is taken to the hospital; Brother Sam offers Dexter support; Debra delivers her first press conference.
Brother Sam believes there is light within Dexter; Batista and Quinn visit a university; Debra is forced to begin therapy.
Dexter is caught up in a personal case; Deb is overwhelmed by her new duties; Quinn's affair with a witness is revealed.
Dexter takes a trip to Nebraska to tie up loose ends; Deb deals with complications of her new position.
Dexter uses lessons from Brother Sam to follow up on leads; Deb and LaGuerta butt heads.
Dexter gets help from an unexpected source; Debra learns something about herself in therapy.
Dexter tries to find the Doomsday Killers' next victim; Debra reacts strongly to a crime scene.
Dexter works to catch the Doomsday Killers; Debra's battle with LaGuerta boils over.