Episode 4 (S05E04)

Sarah Bunting stirs up trouble again at Downton, but this time she might have crossed a line. Meanwhile, Thomas returns home with a mysterious illness that raises Baxter's suspicions about what he's hiding. Violet confides in Isobel, sharing an unexpected story from her past involving Prince Kuragin. Mary makes a choice about Lord Gillingham, but the outcome isn't what she anticipated. The family is left reeling when Rose's father arrives with shocking revelations that change everything.