Neverwhere by Neil Gaiman

This is the novelization of a BBC miniseries written by the famous Neil Gaiman. It has a lot of the comic book style characters in the fantastical other side of London. Richard Mayhew, a young and somewhat passive businessman gets to Neverwhere on accident, after saving the life of a young heiress named Door, with the special ability to open any Door, or make a Door appear anywhere.

It's a good power, but there are evil forces who intend to threaten and trick her into opening a Door that should not be opened. There's lots of danger and excitement. Written years before Gaiman's famous American Gods, there's some bloat in this book as a means to show how clever the writing is. And it's really clever, entertaining stuff. I think anyone can get into this book, no matter what their usual taste is. There's mystery, monsters, danger, slow burning romance, and violence among sexiest and the ugliest of warriors. Check it out.