A medical researcher is sent to a plague outbreak, where he has to decide priorities for the use of a vaccine.

A con artist masquerades as Russian nobility and attempts to seduce the wife of an American diplomat.

Imprisoned at the French garrison on the Isle of St. Noir for putting to death a patient suffering from an incurable illness, Dr. Paul La Roche escapes to the mainland, where he meets Dr. Henry Fontaine, his boyhood friend, and Fontaine's beautiful sister, Yvonne. As Fontaine is going blind, La Roche performs several operations for him, attracting the attention of Dr. Renaud, in Algiers, who offers him a position. La Roche, practicing as Fontaine, reveals his love for Yvonne during an excursion to a Bedouin camp. Then, Lieutenant Destin, from the prison, arrives and threatens La Roche with exposure unless he surrenders the hand of Yvonne.

The wife of an American playwright in Paris becomes ensnared in the seductive wiles of an American Army officer, but her devotion to her husband convinces the officer to try to extricate her from the gossip and scandal that have ensued.

In 1930s Budapest, naïve orphan Luisa Ginglebuscher becomes an usherette at the local movie house, determined to succeed in her first job by doing good deeds for others and maintaining her purity. Luisa's well-meaning lies get her caught between a lecherous businessman, Konrad, and a decent but confused doctor, Max Sporum. When Luisa convinces Konrad that she's married to Max, Konrad tries everything he can to get rid of the baffled doctor.

Nekhludoff, a Russian nobleman serving on a jury, discovers that the young girl on trial, Katusha, is someone he once seduced and abandoned and that he himself bears responsibility for reducing her to crime. He sets out to redeem her and himself in the process.

Guests at a posh Berlin hotel struggle through worry, scandal, and heartache.