Local plans for a war memorial see Carson pitted against Robert and Mrs Hughes. Jimmy receives some female attention that causes him major problems. Baxter is issued with an ultimatum. Tom's burgeoning friendship with Sarah Dunning causes Robert concern. Mary feels ready to try and find love again. Edith and Drewe’s special arrangement starts to crumble as she increasingly finds it hard to keep her emotions in check resulting in some disastrous consequences for everyone.
The family and servants make their way to London for the summer season. The family's London residence, Grantham House, is seen for the first time. Martha Levinson and Cora's brother Harold make an appearance.