Mary is still inconsolable six months after Matthew's death, Edith supports Michael going to Germany to divorce his wife, Molesley looks for a job, and there is a surprise applicant for Ms. O'Brien's job.
An extravagant house party at the Abbey gives the Crawleys a chance to reconnect with old friends, but some guests prove more welcome than others, and along with the celebrations come deceit and heartache.
An unofficial will from Matthew comes into the family's hand, Thomas plots against Anna, Rose gets involved in a scrap at a servant's dance, and Mrs. Crawley tries to reconcile Carson and Trigg.