Here is a biography for young people, outlining the life of the Scottish Reformer John Knox. It details significant events in Knox's life. Did you know that he was once a sword-wielding bodyguard? Other significant details are described such as his friendship with George Wishart, the beginning of his ministry in St Andrews, slavery on a galley ship, his time in France and Geneva, his links with Calvin, return to Scotland and so on.
It also gives an outline of the religious situation in the country at that time and shows the dangers that reformed Christians faced under the reigns of the different monarchs, but also some of the changes that were occurring. Here's a book that is educational and easy to follow. It provides an excellent overview for young people about an important era in their history that sadly seems to be becoming more neglected and forgotten about.