S3E9 · Wee Small Hours

Complete story — includes the ending

After a phone call from Connie, a restless Don drives in to work early and is surprised to see Suzanne jogging along the side of the road so far before sunrise. Betty finds herself drawn to Henry, who proposes that Betty use her house as the venue for an upcoming fundraiser. When Henry sends a different representative in his place at the fundraiser, Betty angrily confronts Henry at his house; the two kiss, but she changes her mind when he locks the door. Meanwhile, Connie disapproves of the new advertising campaign for Hilton Hotels, bewildering Don. Don later visits Suzanne, and they begin an affair. Lee Garner Jr., an executive for Lucky Strike, makes sexual advances towards Sal. When Sal refuses, Lee Garner Jr. calls Harry and demands that Sal be fired; Harry relays the phone call to Roger and Don. As Lucky Strike is Sterling Cooper's largest client, Don shows little sympathy for Sal and fires him, telling him he will land on his feet somewhere else. Sal later calls Kitty from a pay phone, telling her he has to work late, but instead goes out with a group of gay men.