When I first saw this episode on TV a few months back, I thought it was pretty boring. But that was before I saw the other seasons and started to understand the style of the show in terms of storytelling. I came to appreciate the non-violent (action scenes) episodes.
The episode features Sonny realizing a real murder has been committed on a porn film. At first Sonny has doubts, but he begins to realize something more is going on when the director of the film is obviously showing off and getting away with it. This frustrates Crockett and it's becoming very clear as the episode draws to a close.
This episode reminded me much of Manhunter and season 3's "Shadow in the dark". The focus is on a person being obsessed or determined to find the truth. It works well on all levels.