You Season 4: All Your Questions About the Season Finale, Answered by Showrunner Sera Gamble

glamour.com:

Warning: Major spoilers ahead. Everything we were led to believe in the first part of season four was a lie. Joe did not, in fact, allow Marienne () to safely return to her daughter in Paris, Rhys Montrose was just some guy running for mayor, and Joe Goldberg () is still Joe Goldberg.

Now you know why showrunner instructed viewers to rewatch the scenes between Joe and Rhys in her . “What you find out when you get to the end of part 1 is that the first part of the season was a whodunit and the second part of the season is going to be about the relationship between Joe and the killer that he’s discovered,” Gamble told back in February. “So that’s always going to be about what they have in common and what Joe thinks they don’t have in common.”What Joe thinks they don't have in common indeed.

Because in reality, Joe was not being stalked by a working-class megalomaniac but was actually in the throws of an intense psychotic break…well, another one.

This time, though, Joe has completely lost the plot, imagining himself the reluctant hero as his very own Mr. Hyde goes on a murderous rampage and leaves Marienne locked away in a basement to starve.For a show that doesn't typically rely on subterfuge to pack a meaningful punch, season four effectively delivered at least three heart-stopping twists that tricked even this seasoned television viewer.