“We did some test screenings to see, if we add this moment, is it too much? Will people know who the killer is? If we take it away, will they not know at all and will the reveal not feel earned? There were like whole scenes featuring the killer that we ended up taking out because you just knew too soon,” she tells me. “There are clues in the production design. You know, the killer is there. If you rewatch it, you'll go 'Oh my God, he's there.' I like the way I framed things because the presence of [the killer] is in the show.”