A Canadian officer is brought to Downton for recuperation and disrupts everything. Ethel hears distressing news, Bates makes another attempt to settle matters with Vera, while Carson receives a tempting offer. Matthew gets used to life in a wheelchair with Mary as his round-the-clock carer.

The wedding approaches and excitement is in the air, but Branson's plans could rattle everyone. Spanish flu reaches the house and a desperate Thomas looks for a way to re-establish himself. Ethel faces a dilemma when the Bryants return with a heartbreaking proposition, and a decisive Anna forces Bates to think about their future.