Cast
- Laura La Plante as Olga 'The Midnight Sun' Morova
- Pat O'Malley as Grand Duke Sergius of Russia
- Michael Vavitch as Duke's Adjutant
- Raymond Keane as Alexei Orloff - Russian Officer
- Earl Metcalfe as Nicolai Orloff
- George Siegmann as Ivan Kusmin - Banker
- Arthur Hoyt as Yessky - Kusmin's Secretary
- Medea Radzina as Anisya - Olga's Companion
- Nicholas Soussanin as Duke's Aide
- Cesare Gravina as Opera Director