"It's been fifty years since sun sickness wiped out nearly all mammal life on Earth, and the world is slowly being reclaimed by nature, except for roadways here and there, maintained by autonomous machines. The few communities of people who survived keep to themselves in underground sites, only able to come out at night. But now there are two humans who can live and travel freely in the daylight: 10-year-old Elvie and her caretaker, Flora, a biologist who has made an incredible discovery. Using a few scales from monarch butterfly wings, Flora has created an antidote to sun sickness ... Following the monarch migration through what was once the western United States, Elvie and Flora are determined to develop a vaccine to share with everyone. Will they succeed? Or will they fall to natural disaster, illness, or even the very people they're trying to save?"--Dust jacket flap.
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