Dante's Inferno is purely the illustration of life after death, and the 9 circles for those who have committed the conventional sins including the seven deadly ones. My own perception of those was a little different – hear this: they're not sins, they're our vices winning over one circle at a time, given that we let it. It is only by knowing the enemy we defeat it. That's the little hint I can give you. Rest is for you to make out 😉