Fourth series of the period drama about the life and career of the flamboyant and charismatic American entrepreneur Harry Selfridge. Harry is determined to get the store - and his life - back on track with a classic, store-wide summer promotion, but Lord Wynnstay is out to make more trouble. Despite her grief, Mae's new summer collection is a runaway success. A guilt-ridden Jimmy tries to seduce Harry with a daring new business proposition. Kitty's time at Selfridge's comes to a poignant end.