Not Rated Dexter is uncomfortable for having killed an innocent. He visits Arthur Mitchell and his family and learns that Trinity is planning to travel to Tampa. Dexter plots a scheme to travel to a Convention of Meteorology in Tampa to kill the serial-killer. He forces Trinity to give a ride to him and they travel together. Dexter tells Trinity that he had killed a man by mistake in a hunting accident. Trinity brings Dexter to the house where he lived when he was a child and he accidentally killed his sister in the bathroom and Dexter concludes that this was the place where it all started. Meanwhile, in the Miami Metro, Debra shows cases of bludgeoning and convinces Lieutenant Maria La Guerta to chase The Trinity Killer. They decide to collect DNA from people that match the killer's profile expecting to find the serial-killer.