The Book

"If you could see into the future, would you look?"
"Oh hell yes. I'd be living it large on Wall Street"
"I'm serious."
"So am I. I'd be a rich SOB."
"What if what you saw was bad? Would you attempt to alter it, if you could?"

You are given the option. You can alter the future because you knew what it holds. Would you? Mary Ann Nobles has to and now her entire universe depends on the future staying altered.