What is Dante's Inferno about?

The game is based on a poem written by Dante' Alighieri called " Divine Comedy"

The game is based on the adventures of a knight who has committed some of the most evil and poissibly unforgivable sins, when he was returning home to his supposed sister Beatrice and he admits to the fact that she was his wife, no relation by blood. But on his way home he comes to find her brutally murdered by an assassin and has been taken to hell by Lucifer The Fallen Angel, He goes on a Perilous journey to relieve her from this fate even at the cost of his own life and soul but the fact is she was only bait in order for the evil angel to be free from his icy imprisonment.

The poem itself was about Dante's persona of Pilgrim being led through the nine levels of Hell, and observing the punishments of those who were devout in their evil ways.