Gray Skies by Brian Spangler

Centuries ago something catastrophic happened. Historians claim it was an accident that spilled the clouds out of the sky, leaving humanity under a relentless veil of gray.

For young Declan and Sammi, all they've ever known is a world of gray skies and dense fog. Now, at odds about the past and uncertain of their future, they're of age, and it's time to build their lives together.
Yet the coming of the End of Gray Skies has been declared. For a world shrouded in the mysterious fog, the promise...