03E10 - The Color Blue

The 40th anniversary party for Sterling Cooper is approaching, but not many seem to be excited about it. Bertram, who does not feel the need to reminisce, is not planning to attend. And Roger doesn't want to see more praise stowed upon Don, which is supposed to happen at the party. But the Brits at head office want the party to be a success, if only to carry out their clandestine plan. With others in the office, Paul is feeling threatened by Peggy, who he sees as Don's favorite. Paul however comes up with what he believes is a brilliant idea for a campaign, if only he can remember what that idea is. And Lane is feeling pressured by his wife Rebecca, who hates living in New York. At the Draper household, Betty is keeping her distance from Henry Francis, but Don is continuing his affair with Suzanne Farrell. Being the private person that he is, he wants no one to know about it, even Suzanne's epileptic brother Danny, who she wants Don to know. But Betty stumbles across something Don left in his pocket, which may end up exposing more to her than he wants.