It is March 1960. Don Draper, a high-level advertising executive at the Sterling Cooper agency in New York City, struggles to find ideas to keep a lucrative account while at the same time managing his tangled personal life; unbeknownst to his stay-at-home wife, Betty, he is having an extramarital affair. Peggy Olson finds employment as Don's new secretary but immediately finds it difficult to fit in with the other secretaries, especially Joan Holloway. Junior accounts manager Pete Campbell takes a liking to Peggy and pursues her sexually.