William Powell is always worth watching carefully for his inimitable understatements capable of turning any serious business into priceless comedy. There is no Myrna Loy here but instead we have Luise Rainer playing a Russian countess and spy and being absolutely irresistible, almost like Greta Garbo in her suavity, but Garbo was too serious for comedy. Luise Rainer is all comedy and almost outrageously charming. The couple is a perfect combination, William Powell playing a Polish baron in precarious standing with the Car and aware of it. Nevertheless he accepts the classified mission of delivering a petition to the Car, and to keep it safe he applies the secret mechanism of an 18th century silver candlestick of elaborate artistry. The problem is there are two candlesticks like this, and the other one is in the care of the Russian countess Luise Rainer, who also has a mission of smuggling a secret message in her sample. Naturally they are confused in the delivery, there are many additional threads to this mess leading more and more astray, compelling the protagonists to travel all over Europe to Vienna, Budapest, Paris and London chasing the candlesticks, and they finally end up in St. Petersburg facing the Car. It's a labyrinth of a crooked sieve involving also Roland Young as the Czar's son Peter and Maureen O'Sullivan as the only serious woman in the play - the film begins in Vienna with a great New Year's Eve ball at the opera in a obligatory masquerade, where Romeo (Roland Young) meets Julia (Maureen O'Sullivan) and they keep crossing each other's paths. It's a delightful espionage play and comedy and a feast for the eyes with many humorous and risky turns on the way, while for once in a spy thriller there is not one single casualty.