Okay, incredibly annoying red scrolling marquee aside, Atlas Shrugged is a controversial suggestion. Ayn Rand was a decent novelist*, though not great. All her books are built around the philosophy of Objectivism (philosophical egoism by another name; the needs and rights of the individual come first and any hint of something approaching altruism or socialism is evil; the world is black and white, there are no grays) and as such they definitely suffer.
Her sadomasochistic tendencies do make for an odd subtext. In The Fountainhead, the heroine learned that rape was actually just surprise sex she didn't know she wanted.
Be aware that if you read anything by Rand, you'll encounter very, very long soliloquies. In Fountainhead, it was thirty pages as I recall, and I think AS had a 60 page monologue. That's right, 60 pages of paragraphs all beginning with ". Think about how much you'd enjoy getting talked at for hours in real life, and turn that into a book.
* Interesting sidebar, it turns out she actually did prefer it pronounced to rhyme with 'nine'.