Florence Allshorn was a missionary sent to Uganda by the Church Missionary Society long before the advent of jets that span oceans and continents before the sun rises and sets.  A number of missionaries had been there before Florence, but all of them had given up and come back home.  The problem wasn't the climate or the cockroaches.  Neither was it the headhunters or unfriendly natives to whom missionaries, especially female ones, were quite a novelty.  The real problem was the senior missionary who was a strong-willed woman with a will of iron who had single-handedly stopped the plague by burning down entire villages.