Atlas Shrugged, for example. Ayn Rand was one of those who tried to get the last 6 Commandments without the first four. Not coincidentally, there were neither children nor humor among the heroes of her civilization. In fact, the only children in that whole wretched tale -- met only in passing -- were nothing more than little grown-ups.
The precise problem with an atheistic approach to objective morality is that it must rely on something other than God. Ayn Rand never satisfactorily answered the question of why people shouldn't behave like the rest of nature -- she simply assumed that they mustn't do so. It was her secret nod to the necessity for God, but she'd never have admitted it.
There is the gaping 40mm hole in the philosophy of Ayn Rand...
Morality and all of its associated ideals are rooted entirely in the presupposition some higher power defines what is correct for human behavior.
Rand took a premise from the philosophy of Thomas Hobbes and left out the conclusion. Locke did the same thing...
(They also betrayed the logic of Aristotle.)