You can find more detailed recaps of this episode on Collider and Nerds and Beyond . 'You' Recap Season 4, Episode 8 - Vulture
In the eighth episode of You season 4, "Where Are You Going, Where Have You Been?", it is revealed that Joe has been keeping Marienne captive in a glass cage for months, and his mental state is completely breaking down. While Nadia discovers the truth and plots an escape, a hallucination of the late Rhys Montrose forces Joe to confront his violent actions and the fact that he has been starving her. Meanwhile, the episode also follows the dramatic, coercive events surrounding Lady Phoebe’s engagement party and wedding. Episode #4.8You : Season 4 Episode 8