Gustav von Seyffertitz

A Russian spy seduces an Austrian officer to steal state secrets, but both wind up in serious danger after when they fall in love.

After murdering a rich guest to pay off a debt, an innkeeper finds his guilty conscience further tormented by the arrival of a sideshow mesmerist.

A cherished gemstone goes missing after its inheritance by a young lady; the mystery unravels as an inspector uses science to track the culprits.

The eldest resident at a farm for children of unwed mothers fights to keep her young friends safe from the clutches of a wicked master.

An ocean liner secretly being used to test a military technology that can command ships by remote control is hijacked by a hostile foreign power.

The younger brother of a government codebreaker gets entangled in a dangerous espionage mission with international spies and a beautiful double agent.

When a blackmailing nightclub singer is murdered, the investigating detective must uncover her killer among the numerous suspects she had exploited.