Thanks to Mary and Blake, the pigs have recovered in spite of the incompetent pig man. Mary, Branson and Edith offer Drewe the job and he gratefully accepts. Violet, too, has recovered from her scare, and is back to her usual self: acerbic and observant. She suspects that something is going on with Edith. Cora is preoccupied with hosting the annual church bazaar, and with so much work to be done, to keep Rose from losing her novelty in London, Cora enlists her help. But Rose has other plans.
Molesley confides in Baxter that he has come down in the world and she reveals that she has been through difficult times herself. She calls him lucky and reassures him that he can climb back up again.
Dressing Mary for dinner, Anna is visibly shaken to learn that Gillingham and Green are to return. Adamant that Bates not find out, Anna reveals the truth about Green to a horrified Mary, who must be dissuaded from telling Gillingham or the police. Unconvinced, Mary phones to put them off, but it is too late; they are on their way. Anna casually tells Bates of Gillingham's return and Bates questions Anna about her change of heart about Green, watching her reaction closely.
Ivy has received a letter from Alfred, who is returning for his father's funeral, and she reveals to Mrs. Patmore that Alfred has proposed. She writes with him her rejection. Daisy is aware that something is going on and she's being kept in the dark.
While in Thirsk with Isobel, Branson spies Rose and Jack Ross on a romantic day out. On their way home, they encounter Sarah Bunting, who now knows Branson's position, and is quick to question his socialist principles. Later, troubled by what he'd seen, Branson confides in Mary. When Mary cautions Rose not to lose control of her life, she proclaims her love for Jack and plans to marry him and see her mother’s face crumble.
Rosamund decides to visit Downton after a conversation with a desperate Edith, who now plans to give the baby to a trusted tenant farmer. Thinking it far too reckless, Rosamund instead suggests they take a long trip away and have the child adopted abroad. Rosamund abruptly informs Cora that she plans to learn French in Switzerland, taking Edith with her. Under this guise they won’t need to tell Cora the truth. Edith’s decision has been made for her.
Over dinner, Branson recounts the dramatic tale of the pig’s arrival, which sparks some tension between Blake and Gillingham, who are both vying for Mary’s attention. The family is informed of Edith and Rosamund’s plan, but Violet and Mary seem unconvinced. As the servants eat, Green boasts about Gillingham’s London abode on Piccadilly. Baxter admits that she had lived in London for a time.
Mary's three admirers say their goodbyes to Downton. Gillingham wants to see Mary in London, but she refuses; she won’t be his mistress. Despite his plans to call off the engagement, she won’t change her mind. She isn't ready. Violet asks Edith and Rosamund to tea where she puts them on the spot, confirming her suspicions that Edith is pregnant. Violet agrees with Rosamund’s plan and offers to pay for everything.
At Daisy's insistence, Mrs. Patmore breaks Ivy’s news about Alfred, giving Daisy the opportunity to blame Ivy more than ever for driving Alfred away with a broken heart. Alfred still plans to look in on his way back to London, on the day of the bazaar.
Bursting with happy news, Rose tells Mary she’s engaged. Shocked, Mary quickly plans a trip to London with Anna. There, she visits Jack Ross. Ready to convince him not to marry Rose, she finds she doesn’t have to. He knows he can’t go through with it because of what it would mean for her life. Mary then lunches with Gillingham to ask him to dismiss Green, and he reluctantly complies. Gillingham confirms he has called off his engagement and reaffirms his love for Mary, who admits to finding him both beguiling and irritating. With Anna in London, Bates asks Carson’s permission to go to York for the day. The servants are busy with preparations for Saturday’s bazaar. Mrs. Patmore offers Daisy the day off so she can visit Mr. Mason and avoid Alfred.
Branson encounters Sarah Bunting with a broken down car. Stopping to fix it he reveals more about his history with the Crawley family, which softens her opinion of them. As set-up for the bazaar continues, Downton is a hive of activity. Seeing Branson carrying chairs, Sarah Bunting suggests the family are using him as a beast of burden.
As Daisy and Mr. Mason share a picnic, he encourages Daisy to return to Downton to say goodbye to Alfred. Arriving at the bazaar, Alfred apologises to Ivy for getting the wrong idea and they agree to part as friends. Daisy arrives back at Downton just in time to catch the departing Alfred, who admits he has been blind over Ivy and may have made a mistake. They part as friends, making Mrs. Patmore proud.
Rose has received Jack’s letter and is furious with Mary. Robert and Thomas make a surprise entrance at the bazaar with their unexpected return, bearing the happy news that Harold got off with a reprimand. Gillingham, too, arrives at the bazaar unexpectedly, with the shocking news that Green is dead after stumbling into the road in Piccadilly. Anna is shocked and concerned about Bates, but is relieved to hear that the pavement was crowded and lots of people witnessed his fall. But when she later seeks reassurance from Bates, he doesn’t ease her concerns.
Blake also turns up unexpectedly, confessing to both his and Mary's surprise that he can’t stop thinking about her, and wants her to give him a chance. He won’t give up without a fight.