"Ring of Fire III" is the third book in the series of science fiction novels written by the famous writer Eric Flint. In this book, readers once again find themselves in an alternate world where the heroes are accidentally transported back in time to the 17th century during the Black Death. This book combines historical facts, scientific technology and an exciting plot, creating a unique and exciting atmosphere. "Ring of Fire III" not only reveals the historical events of the late Middle Ages, but also makes readers think about the essence of time, history and human actions.