Douglas C. Percy

Bill McAdams, young missionary doctor shuddered to think what the slim African had endured because of his love for Salanatu, daughter of the Kitta witch doctor. Though this is a work fiction it is based on facts in the lives of those the author ministered to in Nigeria during his tens years there.

This is the best missionary biography you've never read. Stirrett was a man with a mind of his own, a tireless and fearless explorer, a highly intelligent and compassionate doctor whose treatise on tropical medicine was the indispensable handbook for health workers of all kinds for generations; a translator, teacher, trainer, and eccentric missionary.

A small paperback in the "One Evening Condensed Book Series" published in the '50s and '60s by Good News Publishers. There were a wide range of Christian topics in this series and everyone I have read thus far has been a gem.
This particular book is a fiction based on factual elements of life in Africa for a missionary. Very interesting and gripping.