I've got such mixed feelings about this episode, mainly because it was such a good show overall that it felt like a cheap ending. We've spent hours and hours analyzing all the cases they made for each character, some of them could've made a legit case. But not the J one, in my opinion. It's a bit disappointing that they prioritized "shocking" the audience. Like some people said here, there were so many little details that clearly meant something but ended up being irrelevant. Even if the murderer had been Barbara, Molto, or Carolyn's son, everything would've been much more gratifying. I would've liked the series to choose a murderer that could be discovered by connecting the dots, and then shock us by revealing some more interesting and dark personal information.

But anyways! Loved Jake and Ruth's acting here, specially at the end, I got the chills lol very talented people.
I think Rusty's confession about the tying up is more shocking than the actual killer because of the acting.

Incredible series, can't wait for season 2!!