Thanks to a line in Agatha All Along's opening episode, we'd all assumed that the 'black heart' that marked the final name in Lilia's list of potential coven candidates had been Rio. Now, though, it seems like that could've been a misdirect – and fans think they've worked out who it was actually referring to instead.
Warning! The rest of this article contains spoilers for Agatha All Along episode 6. If you've yet to tune in, and don't want to know anything that happens, turn back now!
