This series, much like the others but perhaps even more so, has gone completely off the rails now. I decided to give the show one let go as the concept is decent. But in this episode realism has complete gone out of the window. There's suspending your disbelief and then there's completely ignoring all concept of realism.
Nothing any of the characters do makes any sense whatsoever and is completely irrational. Reactions and dialogue are completely fascile and so lacking in depth it beggars belief. Every character is an unlikeable and completely idiotic moron whose actions make zero sense.
The killer is revealed in this episode so there goes any suspense built over the previous episodes.
The killer's motives are not explained and so basic as to be ridiculous and their actions are completely illogical, self-defeating and incoherent, yet they're supposed to be an intelligent character.
This is just absolutely terrible writing, despite the first few episodes being acceptably okay. Just like the other seasons, you have to be stupid now to not notice all the lack of realism, coherence and totally bizarre and nonsensical actions of the characters.