Four titles have been added to Mystery Files - exciting and readable stories about mysterious events and phenomena. Each story is told within a spread so readers can dip into the book or read from cover to cover. The topics range from ancient times to the present day and include both well-known and less familiar mysteries. Each spread has a Mystery File box, which may offer a rational explanation for the mystery, explain some of the background history to set the mystery in context, or look at how the mystery has been explored in books and movies. The text is carefully tailored for reluctant readers. In addition to the glossary and index, each spread contains definitions of more difficult words.