With season 4 episodes going steadily downhill, this episode picks it up a bit. At the risk of sounding like a fan, I believe that it's all due to the appearance of Da'an. Episodes with him in always seem to be better than episodes without. This episode is centered around the character, and that's probably why it's better than most others this season. Not only is Leni Parker a great actress, but the character is always well written and easy to get to know and like.
This is another of those episodes, like "The Cloister" of a previous season, where through most of the episode, it appears as though Da'an is actually up to no good, only for it to be reveiled near the end that he was actually doing good instead, as always. My favourite line in the whole episode has to be the one at the end, where Liam says "I had to tell [Da'an] what happened just so he would stop looking at me funny". Or something like that, I'm sure it's not a direct quote. It was hilarious though!