London, 1928. Nine years have passed and Harry Selfridge (Jeremy Piven) is at the pinnacle of his wealth and celebrity and enjoying the frenzy of the roaring 20s. But in this buzzing, fast-evolving world, Harry is splashing his cash in an unprecedented, dangerous way. As he parties and gambles with stage stars, the Dolly Sisters, and pursues risky new business ventures, the trials and tribulations of our other much loved characters, and a handful of newcomers, also unfold. Lady Mae (Katherine Kelly) returns to London to rebuild her life whilst Miss Mardle (Amanda Abbington) and Mr Grove (Tom Goodman-Hill) thrash out their differences, and Kitty (Amy Beth Hayes) and Frank (Samuel West) embark on the biggest challenge to their relationship yet.