Elinor Shale's happiness at being engaged to Gerald Forster is interrupted by the arrival of her sister Lucy, who confesses that she will soon give birth to an illegitimate child.
A wealthy old man is murdered after deciding to write his nephew out of his will. Fearing that he will be accused of the murder his nephew takes flight but, with the help of a young woman whose life he saves, he has to try and track down the real murderer.
Prince Sami comes from Nigeria and is an uncivilized "nature boy." He is sent to the highly civilized court of Duchess Maria of Arragon, where he initially causes chaos.
Engrossed in the perfection of a new high power explosive, the husband seems to neglect his wife. She is further piqued by the introduction into their home of a man whose presence is unexplained, but who is really a Secret Service operative guarding the invention.