My first exposure to Mike Carey was through is Felix Castor novel series, but he actually is a more prominent comic author. The Unwritten is the story of Tom Taylor, whose father wrote a best selling children's fantasy series with a main character somewhat inspired by Tom (Think Harry Potter).
His father disappeared under mysterious circumstances, and since then, Tom has been doing nothing except getting drunk, and doing the convention circuit, signing books, and giving lectures. Many fans of the series are fixated on him, believing that he really is "Tommy Taylor". Things start getting weird, however, when someone accusing him of never having existed, followed by the very real appearance of a character from the Tommy Taylor book series.
Tom knows nothing of any kind of magic, and all he knows is the geography of story telling that his father taught him. He knows where stories were written, and what real world places were used to inspire fictional locales. Here's where I run into a bit of a problem, I know a bit about classical literature, but I really haven't read much of it, and I feel like a lot of this stuff is just going over my head. If I knew more about Oscar Wilde, Mark Twain, or Rudyard Kipling, I think I would have a much better head for what they're talking about in passing.
Ultimately, I just bought the first trade paperback collection of the comics, which ends on quite a cliffhanger, I'm undecided if I enjoyed it enough to seek out the rest of it though.