If you want novels, Flatland is one that plays around with the idea of dimensions. A Curious Incident of the Dog in the Night-time is a nice book that makes references to mathematics. You probably already know about the relationship between mathematics and Alice's Adventures in Wonderland. The literary analysis of this book from that perspective can be pretty interesting.
http://en.wikipedia.org/wiki/Alice's_Adventures_in_Wonderland#Symbolism might be a place to start if you don't know much about that interpretation.
If you want to learn some maths, I'd have good things to say about MAA's Anneli Lax New Mathematical Library series of books. Some of these might not be too accessible of a read, but quite a few of them will be perfect for high schoolers and so on to read. They were originally aimed at high schoolers, but later on they expanded their target audience to undergraduate students too. There was a list of all the books somewhere but I can't find a complete one at the moment, if I'm not mistaken there were 30 or 40 odd books in this series. A few of the Student Mathematical Library books might be accessible too, but you'd probably have to check for yourself.
http://ams.org/bookstore/stmlseries University libraries should stock most of the books from either of these series. If you're poking around university libraries, they should have a section with recreational maths books, as well as a section of biographies too.
Gödel, Escher, Bach is a pretty interesting book that touches on quite a few other fields, including mathematics. There's a series of lectures that might help digesting the book a bit easier
http://ocw.mit.edu/high-school/humanities-and-social-sciences/godel-escher-bach/ Euclid in the Rainforest by Mazur is good too.
Martin Gardner has written a lot of recreational maths books and is quite well known for it (The Colossal Book of Mathematics might be one to look into). John Stillwell has also written a few good books too. If you want someone a bit more local, Marty Ross and Burkard Polster have published a lot of stuff on
http://qedcat.com/, in particular their articles in The Age and their annual lectures might be of most of interest.
For more biographical stuff, I haven't read the Indian Clerk, but I'll take a stab in the air and guess that it's about Ramanujan - "A Man Who Knew Infinity" is also another good one about him. "N is a Number" about Paul Erdos is quite interesting, that's a documentary. If you want a book about him, "The Man Who Loved Only Numbers" is one. I could go on and list more, but there's usually a lot of interesting stories or anecdotes attached to all the big mathematicians that get idolised, as well as the problems/theorems they worked on. Wikipedia often mentions this kind of stuff and you can probably find more books from there e.g.
http://en.wikipedia.org/wiki/%C3%89variste_Galois I find Russia's history with mathematics to be pretty interesting too.
Surely You're Joking Mr Feynman is about the physicist of course, but mathematics does make an appearance naturally. This is a pretty light-hearted set of short stories which reveal a lot about his character. If you enjoy reading about him, I'd also strongly recommend watching the documentary "The Pleasure of Finding Things Out"
I've gone on quite a few tangents from what you were asking for, so I might as well add if you want some internet resources, you might find the soft-topics on
Math Exchange to be a good place to point you to some more maths/books.