This week's Phoenix Pick's Amazon promotion is Arkfall by Carolyn Ives Gilman, a novella that was nominated for the 2009 Nebula Award. This is the product description:
Nominated for the Nebula Award.
Humans live deep within an apparently lifeless planet covered by massive ice sheets. Having to survive in confined spaces has bred a unique culture where deference and non-confrontation make co-existence possible.
Osaji’s opportunities are limited by the need to care for her aging grandmother. But all that is about to change as circumstances push her toward a journey like no other.