Season 4 of You follows Joe Goldberg as he relocates to London under the alias Jonathan Moore, trying to start anew but quickly falling into darker patterns. The season reveals Joe's mental breakdown and introduces a new social circle of wealthy elites, many of whom he despises but mingles with nonetheless

. Key plot points include:

• Joe becomes involved with Kate, a wealthy woman who despises her billionaire father, Tom Lockwood. Joe and Kate develop a complex relationship despite Joe's violent tendencies

• Joe is revealed to have an alternate personality, "Rhys," who is responsible for a series of murders attributed to the "Eat the Rich" killer. Joe himself is the true killer, though he dissociates and hallucinates a version of a man named Ree Mandros, whom he blames for the murders

• Joe kidnaps Marienne, a woman he had been pursuing, holding her captive in a glass cage. Marienne fakes her death and eventually escapes, with help from others

• Joe frames his student Nadia for one of his murders to cover his tracks, marking a darker turn for his character

• Lady Phoebe, another character, escapes an abusive relationship and eventually leaves the elite London scene to teach English in Thailand after a traumatic experience involving a stalker and her manipulative fiancé Adam, who is later killed by hired hitmen

• The season ends with Joe killing Tom Lockwood, attempting suicide, but surviving. Joe and Kate agree to be honest with each other, and they move to New York City together to start a new life, with Kate now in control of her late father's fortune

• The final scenes suggest Joe's self-awareness of his destructive nature, setting up for the final season

Overall, Season 4 deepens Joe's psychological complexity, showing his dissociative identity disorder and escalating violence, while exploring themes of wealth, power, and identity in London’s elite society