New Moon (1930 film)

New Moon is a 1930 black-and-white American, pre-Code romantic/drama/melodrama musical film version of the operetta "The New Moon", with music by Sigmund Romberg and book and lyrics by Oscar Hammerstein II and others. The original stage version premiered on Broadway in 1928. The 1930 film is also known as "Komissa Strogoff" in Greece, "Nymånen" in Denmark and "Passione cosacca" in Italy. A second adaptation, also titled "New Moon", was released in 1940.
The 1930 film, directed by Jack Conway, starred Grace Moore and Lawrence Tibbett. Its plot is entirely different from the original play and is set in Russia. This version added new songs not by Romberg.
Synopsis.
"New Moon" is the name of a ship crossing the Caspian Sea. A young man named Lt. Petroff meets Princess Tanya and they have a ship-board romance. Upon arriving at the port of Krasnov, Petroff learns that Tanya is engaged to Governor Brusiloff. 
Petroff, disillusioned, crashes the ball to talk with Tanya. When the couple are found by Brusiloff, they invent a story about her lost bracelet. To reward him, and remove him, Brusiloff sends Petroff to the remote, and deadly, Fort Darvaz. Soon, the big battle against overwhelming odds will begin.