Frances Gadsby, 17, is a Keeper of Dragons who takes on evil in 1884 Duluth, Minnesota. Dragons, seen only by Frances and her kind, feed on emotions bred by the seven deadly sinsanger, greed, sloth, pride, lust, envy and gluttonyand it is Frances' job to slay them. When the past abruptly intrudes on her friend Katie Waverly's life, it brings danger-and dragons-to everyone they love most.