A flighty and imaginative British woman married to Harry. She has an affair with Billy, exaggerates her husband's role, and later exposes the crooks' uranium scheme and murder plot to authorities, ultimately reconciling with Harry after he succeeds in acquiring the land.
Their illicit affair complicates the expedition and their marriages.
While waiting in Italy, Billy and Gwendolen have an affair.
Their marriage survives deception, scandal, and separation.
The plot identifies Gwendolen as Harry's wife, and they travel together on the same ship.
Gwendolen's testimony directly causes Peterson's arrest.
After landing, Gwendolen reveals Peterson's scheme, his involvement in the murder, and his attempt to kill Harry.
O'Hara is implicated in the group that Gwendolen helps authorities dismantle.
Gwendolen exposes the scheme, and Julius O'Hara is arrested along with the other conspirators as a result of the investigation.
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