Chan, in Paris for a reunion with friends from World War I, becomes involved in investigating the murder of a munitions manufacturer who was supplying arms to the enemy, even as the rising clouds of World War II force the city into nightly blackout status..

On the night before he sails in search of the steamship Arcadia's sunken gold, Paul Sinclair (Bruce Bennett)meets Madeliene Nielson (Anita Louise) in a San Francisco nightclub. On the second day at sea, Madeliene turns up as a stowaway. While diving and searching for the sunken gold, off the Phillipines, Paul discovers that a foreign-country submarine has been laying mines in order to completely cut off the Phillipines from American protection.

Bob Conrad is the playboy son of town squire Charles Conrad. Much against his dad's wishes, Bob falls in love with Dorothy McCarthy, the daughter of penniless widow Mrs. McCarthy. At the insistence of his dad, Bob weds Sally Lace. Dorothy's broken heart is mended however, when it turns out that Sally's divorce from her previous husband was never finalized.

Mercenary Donovan is hired to kidnap King Peter II. He learns that the party in power is evil and that the King is in danger, so kidnaps the King to keep him safe while a revolution is planned.

The story of a single swallow who, taking a rest from southward flight at a mission in California, ultimately brings about the famed migration of swallows to the mission at San Juan Capistrano.

The curse of a shark god follows a group of people who have violated a sacred jungle idol.

An American tourist in South America finds love and unexpected trouble.

Half-Indian girl brought up in a wealthy household is loved by the son of the house against his family's wishes and loves another Indian employed by the household.

In Shanghai amidst Sino-Japanese warfare an adventurer (Sanders) collecting money from gun suppliers falls in loves with a French singer (Del Rio).

The Falcon travels to Mexico where he gets involved with murder and a mysterious painting.

A groom-to-be contracts syphilis and wrestles with the consequences of his diagnosis.