Ep. 22: Mary enrolls at St. Paul Academy and meets Lynn after returning from the airport.

Sarah departs to live with her grandfather, while Lynn remains unaware of her father's passing. Edward is discharged from the hospital and meets Lynn at the entrance, where she announces her return to Marble Mansion. Arthur accompanies her, and they encounter Mary, who has just arrived from the airport. Arthur fears Mary will bully Lynn again. Mary visits her grandfather at the bank, where he reveals plans to purchase the marble home for her and expresses hatred for George due to the baroness and Thomas's disdain for London. Mary requests enrollment at St. Paul Academy and moves into Vivian's residence because her father works at the bank. The following day, Mary and Vivian admire Elizabeth when Lynn arrives. Vivian questions Mary's connection to Lynn, who identifies herself as the daughter of a poor viscount. Vivian concludes they are not friends and decides to befriend Mary.
Episodes
- Ep. 18 · Lynn and Sarah renew their promise while a missing horse and lost necklace cause confusion.
- Ep. 19 · Sophie encounters her mother at Turner's farm after Isabelle arranges a surprise reunion.
- Ep. 20 · Lynn dreams of Edward and Arthur while friends navigate Peggy's forced marriage to Eric.
- Ep. 21 · George and Sarah Visit Lynn While Jim Prepares for the Upcoming Ten-Day Deadline
- Ep. 22 · Mary enrolls at St. Paul Academy and meets Lynn after returning from the airport.
- Ep. 23 · Mary Invites Arthur to Party, Lynn Gets Angry, Edward Attacks Arthur
- Ep. 24 · Lynn and Vivian compete in a daybreak race after Mary's intervention
- Ep. 25 · Principal suspends Lynn while Philip investigates Mary and Edward confronts Vivian about the truth.
- Ep. 26 · Lynn faces a crisis as horses head to championships and secrets surface among friends.