Fiction allows for moral questioning, but through the back door. Personally, I like books that make you think - books you're still wondering about three days after you finish them; books you hand to a friend and say "Read this, so we can talk about it."
Jodi PicoultThere are stars in the night sky that look brighter than the others, and when you look at them through a telescope you realize you are looking at twins. The two stars rotate around each other, sometimes taking nearly a hundred years to do it. They create so much gravitational pull there's no room around for anything else. You might see a blue star, for example, and realize only later that it has a white dwarf as a companion - that first one shines so bright, by the time you notice the second one, it's too late.
Jodi Picoult