Sunshine Susie was a remake of the German film The Private Secretary, and retained many of the originals general characteristics. Renete Muller who starred in the original, was again cast as the country girl seeking fame and fortune in the big city. She takes a secretarial job at a bank, and sets about catching the heart of her boss, Herr Hasel (Jack Hulbert).
A young woman, Margaret Dauncey, is caught between the forces of a charlatan magician, Oliver Haddo, whom she is unable to resist, and the love of a handsome surgeon, Arthur Burdon, who has saved her from being a helpless cripple by performing a delicate operation on her spine.
Two typists, one attractive, the other efficient, fall in love with the son of one of the firm's partners. The young man makes overtures to the attractive girl but finally finds a match in the plainer one, while the other girl realises the worth of the prim and correct head clerk.