Oh, What A Night is a 1944 crime drama starring Edmund Lowe & Jean Parker and directed by William Beaudine.
Jewel thieves Rand, Tom Gordon, Rocco, Boris, and Countess Sonya meet at the California Hotel to await Lillian Vanderhoven, a former burlesque dancer who is now a wealthy dowager and has acquired an expensive diamond known as the "Kimberly King Diamond".
Wyndy wishes to steal Vanderhoven's diamond, but learns of Rand's promise to Detective Norris.
Rand decides to retrieve the gemstone, but doesn't want to alert Valerie, to whom he has become fond of, to the fact that her uncle is a thief.
While Gordon is packing his suitcase in front of Valerie, Rand forces him to hand over the diamond at gunpoint.