The Map To Allagia, by Mahomed Zahir

The Map to Allagia is a fiction novel as it is based on events that are entirely made up. The author used a combination of narrative and expository in his writing style. As he told a story but also went on to describe events within the narrative

The story is centrally focused in another realm, the realm acts as a gateway between earth and hell, in this realm you will find demons and other monsters that are trying to get to earth but the realm is protected by the city of Allagia. Hence evil forces intent on destroying Allagia to escape the realm and raid earth, however that's easier said than done as the city can only be located with its map and is invisible unless the map is in its vicinity.