The Affair (S04E04)

When Jean's sister-in-law discovers that her husband is being unfaithful, she opts to move in with Jean and Lionel for support. However, the truth is far from what she believes; her husband's secrecy stems from his plans to organize a surprise anniversary celebration for her. As tensions rise and misunderstandings unfold, the couple must navigate the complexities of love and loyalty amidst the unexpected houseguest.