Zeffie Tilbury

A glamorous courtesan and an idealistic young man fall in love, only for her to give up the relationship at the behest of his status-conscious father.

The former World War I British officer-turned-private investigator brings along his fiancee to help him catch dangerous spies with a stolen death ray.

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.