Mad Men: The Wheel / Season: 1 / Episode: 13 (2007)

Betty discovers a secret, leading her to re-evaluate her marital situation. Peggy gets promoted but receives news that may interfere with her career. Pete brings in a big account through his father-in-law but has to commit to his wife in return. Don's professional and private lives affect each other in curious ways as he's left to fend for himself. Don elects not to spend Thanksgiving with Betty's family.