Dexter spends the episode sending his wife and kids away so that they'll be safe from the Trinity killer, who has worked out Dexter's real identity. His kids go to Disneyland with their grandparents, and he convinces his wife to go on holiday to the Florida Keys with him and their baby son, with Dexter meeting up with them after he's "taken care" of some business. He then proceeds to track down Trinity, eventually finding him, and Trinity's last word are "It's already over", with a sad look in his eye...
Exhausted, Dexter walks into his home and sits at the kitchen table after disposing of Trinity's body. Smiling to himself, he takes his phone out of his pocket and turns it on to find one new voicemail message. It's Rita, telling him she left her passport at home and that she is coming back home to get it. Worried, Dexter rings her phone only to hear it ringing on the kitchen counter, and his son then starts to cry from down the hallway. He runs into the bathroom, to find his wife in bathwater tinted red by her own blood, and his son sitting in the overflow on the floor