When Earth passes through the tail of a comet, the moon turns purple-and a mysterious plague wipes out the world's adults and older teenagers.
On a small island off the coast of Maine, thirteen-year-old Abby Leigh must protect her younger brother and sister while helping a community of children build a new world from the ruins of the old. But Abby faces an enemy she cannot outrun.
She is growing up.
And in this world, adolescence is deadly.