John Winslow, a restless young college dropout, tries many jobs and finally goes to Africa to visit a missionary relative. John falls in love with Africa and decides to stay, becoming a professional hunter.
Annie Rogers, another of the Winslow family, tries to pursue her dream of becoming a missionary to Africa but is turned away by several mission organizations. An opportunity to work as the personal secretary of a wealthy young socialite seems to contradict Annie's calling, yet she feels it is the right step. A whirlwind trip to England is followed by passage booked to America on the maiden voyage of the R.M.S. Titanic!
These very different lives, separated by continents, seem destined to collide, yet danger roams the dark ocean as surely as it does the Dark Continent.