Dateline: 1921—Northern Rhodesia and New York, New York. 

Lizzie MacTavis is determined to remain  with the people with whom God
called her to work along the banks of the rugged Zambezi River in
southern Africa.

Andrew Styles, an anthropologist and explorer, has been commissioned to
bring Lizzie back to New York City at any cost. With a fortune at stake,
Lizzie is caught between two worlds when she is finally forced to
return to the United States and discovers her life is in danger. Will
Andrew turn out to be Lizzie’s nemesis or hero?