The mysterious Ice Truck Killer escalates his killing spree by leaving body parts of his latest victim at sites that relate to memories from Dexter's childhood, leading Dexter to confront his dark personal history.
Debra and the rest of the squad start to make headway when one of the Ice Truck Killer victims is found alive. Meanwhile, Dexter gets in over-his-head trouble when he begins stalking a murderous human-trafficker.
The Ice Truck Killer leaves a surprise dead body for Dexter at one of the crime scenes of Dexter's most recent kill, which puts him in the crosshairs of his own Homicide Division of the Miami Metro Police.
Dexter races against the clock to find Debra when she is abducted by Rudy, the Ice Truck Killer, which leads the two psychopathic killers to have a fateful showdown, and who finally reveals his connection to Dexter.