Helen Roseveare (1925-2016) was a missionary doctor who served the Lord in the Belgian Congo. Give Me This Mountain is her story. It is not easy to read because of the persecutions that she faced, but her desire to give glory to God despite the difficulties should be an encouragement to all. I encourage you to read this book.
Justin Taylor, from the Gospel Coalition, has written a short summary of her story here, including several quotes from her.
And if you don't read the book, at least watch the following videos (not something you will hear from me often!).