Complete story — includes the ending
Duck calls Peggy to offer her a job at the agency he intends to start, but she turns him down. Facing an impending deadline for the Samsonite account, Don forces Peggy to stay late to work on the campaign, causing her to miss a birthday dinner with Mark, who has invited her family as a surprise. When Peggy calls Mark to cancel a second time, an infuriated Mark breaks up with her over the phone. Peggy lambasts Don for being unappreciative of her work and leaves in tears. Don calls her back into his office and they reconcile. Over dinner and drinks, the two intimately discuss their lives. Returning to SCDP, Duck arrives and drunkenly accuses Peggy of being "just another whore"; Peggy gets rid of Duck and reveals their past affair to Don. Don falls asleep in Peggy's lap and experiences a vision of Anna smiling with a suitcase. The following morning, Don calls Stephanie and discovers that Anna has died, causing him to break down in front of Peggy. Later that morning, Don informs Peggy of his new idea for the campaign; she reassures him that it is good, and the two exchange meaningful looks before she leaves.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Mad Men season 4. HTML formatting and reference markers removed. · Content license