Four Sisters - Hardcoverby Harlan R. Musil (Author) The book Four Sisters was inspired by conversations with a Muslim lady (Fatima) with whom I workout at a local gym in Lincoln, Nebraska. Fatima, being very friendly, shared stories about her family. The book is about Fatima and her other three sisters as they are young Muslim American women who are very similar to other American women while upholding their Islam beliefs. The book tells some of what Islam Muslim culture is.