Grand Escape — Michelle Bryan

Fourteen-year-old Sam McKinley and his kid sister, Amy, are left unprotected in a dying world. After the alien invasion, there's no one to turn to. No one to help. Or so they thought.

When Sam hears a voice on the other end of their shortwave radio offering salvation, it ignites a tiny spark of hope.

This may be a story about survival. But it's only the beginning.