This is the third of the trilogy and I have also read and reviewed the first two, Schism and Collision. While this is a standalone book, I recommend reading the three in order. It will help to understand the growth of the characters and will keep the flow of the story. This isn't the genre I usually read, but Michael Phillip Cash writes books that are easily readable with a style that crosses genre.
All three books present stories of adventure, mystery, and interesting characters. Risen is no different, and the book this trilogy concludes with a satisfying ending. Through all of the struggles, war, and captivity, there is a message of hope and encouragement.