R. M. Ballantyne
Robert Michael Ballantyne was one of the most popular boys' authors of the Victorian era, and deservedly so. He was a Christian writer of adventure stories, and thoroughly researched his subject before writing; often visiting the location he would be describing, in order to understand and portray it better. It has been said that "what G. A. Henty did for a boy's understanding of history, Ballantyne did for his understanding of geography." His books however are not mere traveling guides, but tell an interesting story, full of action and humor; always from a Christian perspective. Occasionally there will be an issue, especially when the books involve romance, such as the main character speaking to a girl of love before talking to her father, but this is not very common.
In most of Ballantyne's books, especially those dealing with unreached, savage tribes, he strongly addresses the need for missionaries to preach the Gospel, and presents a clear Gospel message in the story.