Brightest Day Volume One.
The basic premise of Brightest Day couldn't be simpler: Twelve dead super-folks, consisting of a mix of both heroes and villains, are brought back from the great beyond by the Entity - avatar of the light of life itself, from which the White Lantern battery draws its power - to go on to serve some initially-unknown (presumably higher) purpose.
But why were these specific individuals chosen? Why were other, seemingly equally-deserving deceased superheroes not also returned to the land of the living - and why were there ever even any villains in the mix to begin with?
All of these issues and more are wrestled with by those who were resurrected to play some important role in the titular 'Brightest Day' that is still yet to come. And at the end of this first collection, these answers are indeed revealed... albeit in a typically-cryptic fashion.
Although the following example is also vague, I will not intentionally spoil which of the twelve characters received this particular revelation. Still...
(Paraphrased) "You have already done all that was required of you. Good job! Enjoy being alive again."
Sure it's just a small thing... but man, is it ever cool!