He was once a Sumerian god, one of the most powerful in his pantheon. He was worshipped and revered until the night that Artemis tricked him. She stole his powers and left him near death, agreeing to Acheronís request that he be made a Dark-Hunter. Now Sin works alone, trusts no one, and dreams of exacting revenge on the goddess who stole his life.
Artemis knows that Sin is up to something. She asks Katra to find Sin and make sure that the Sumerian Tablet of Destiny stays out of his hands. With that relic, Sin could destroy her. Katra agrees, but discovers that Sin is after more important targets. Demons who could destroy the world if they are not stopped. In order to imprison them, Sin will need his god-powers, and they now belong to Artemis. How is Kat going to keep Sin from killing the goddess, and how will they stop the demons?
For me the best part of Devil May Cry was the revelations about Acheron, Artemis and Katra. Acheronís arrangement with the spiteful goddess has tantalized readers throughout the series, and we learn some more important information. This is all leading up to Acheronís story, one that we have been waiting to read since the series began.
The romance between Sin and Katra had many surprising aspects, and the action was page-turning, but for me the revelations about who Kat was, and how she had played an earlier role in Sinís life were key elements. If they were going to be together, there was a lot of ground to cover, with trust and forgiveness on all sides.