Filmed in Paris and along the French Riviera, Dinner at the Ritz afforded David Niven the chance to play his first starring role. As Paul de Brack, he is a government agent and playboy and is quite at home among the elite set, whether in England or France. This comes in handy when he falls in with Ranie Racine (Annabella), a gay Paris socialite and the daughter of a recently murdered financier. The father's death has been ruled a suicide, but Ranie refuses to accept this. As the man assigned to investigate the banker's death, Paul accompanies Ranie on a series of undercover investigations that take them to Monte Carlo and London. Along the way, they discover the truth about a serious banking scandal, as well as evidence that the man responsible for {Racine's death may be someone close to Ranie.