And American crime dramas don't have a consistent theme. American producers, directors, and writers should study their British counterparts. The Brits have a theme. They love cops who are broken human beings. The more dysfunctional the better.
John sees dead people. He talks to them. They talk back. John responds physically and emotionally to them. Like I said, John River is barking mad. A nutter, as the Brits would say.