The book I am reading is about a book series called "Death Note" with a cast of unusual characters. The main character is a detective that uses the fake name Rue Ryuzaki Aramaki. His Father figure or right hand man just uses the Watari.

The main plot is there is a deadly virus that is spreading through Beijing, and the virus was obtained and taken to a research lab to Japan so it could be studied and let a antidote be made for it, but one of the scientist that was apart of an organization call "Blue Ship" has taken the antidote and the virus and is threatening to spread it to all of Japan if she doesn't get what she wants. So Rue Ryuzaki has to figure out how to get the virus back or how to neutralize it before it's spread to the open public.