This is not a  complete summary of the novel, but it is based off the game of Devil May Cry 4, only the creator of this novel, Morihashi Bingo (Devil May Cry 2, 3, and 4 scenario director) changed things around.

Here's the link to the summary -> http://devils-lair.org/dmc4novel.html

And here is the full translation of the novel (Warning: Possible mistranslations and lots of Shakespeare talk -> https://originaldmc.github.io/DivinityStatue/Downloads.html