Blood Ties — A.J. Quinnell

The story of a quest -- a quest with a motive so powerful that it spans continents and unites strangers in danger and love. The world of Kirsty Haywood is mundane if undemanding. But during a freezing New York winter her world is suddenly shattered: her only child, Garret, is reported dead in East Africa. Somehow Kirsty senses that he is still alive, and to lend credence to her conviction, she is willing to sacrifice everything -- job, lover, apartment.