Dexter and Harrison find themselves closer than ever over Christmas break. What kind of gifts will this father and son give to one another? But this brings this father and son into the crosshairs of a very violent and scary serial killer. Angela starts to wonder if Iron Lake is not the cozy and safe place she always thought it was.

Dexter and Harrison try to live a normal life in a place that they have discovered is not as normal as they thought it was. Will the two of them be able to live happily ever after, despite all the threats coming their way?  Season finale.