The Other Detective

Just like L, this other detective is very well known for. They don't go by a face or name, the only thing people know of this character is the title they go by, known as C. They help solve some of the most difficult of cases. Even worked with L once, never face to face of course, both detectives hide behind their computer screen.
The real question isn't who these two are.
It's what they are going to do when they are forced together to stop an unknown force.
If they don't succeed the whole world could, no will be corrupted by evil.
What is this evil you ask?
Everyone knows, you know right as you read this very passage.
It's the curse of the Deathnote,
The very thing death gods use,
It has fallen into a certain person's hands,
Known as Kira,
And C knows all to well about troublesome Shinigami.