Themes: Biography, Activist,Equality. As a minister and an activist, Martin Luther King Jr. dedicated his life to helping others. He fought for equality during a time when Black people in America experienced great injustice. His life and legacy continue to inspire others to push for change.Blue Delta Books™, a Hi-Lo Books™ biography series, tell the stories of people who have changed our world in profound ways. This series features a diverse group of people. Some are more well-known than others, but all deserve to be highlighted for the positive impact they have had. Each Blue Delta Book features full-color images on every page and tells the person's story from childhood throughout their life. These books are sure to inspire young teen readers. Each book is 48 pages long.