This episode is a complete dud. The plot with Adam isn't consistent with the existing narrative up to this point and feels forced. He isn't even a remotely interesting character. On top of this there is a new female co-narrator, who is a disaster from the get go. She breaks up the flow of the story and makes the show very hard to watch. If it ain't broke, don't fix it!
This show may have peaked with the great season 3, which is rather unfortunate.