Meltdown

In the final book of this middle grade sci-fi series, superpowered teens are on the verge of saving Earth from a mutant race when one of them disappears. Toni Douglas feels like she''s losing her mind. But maybe that''s to be expected when you''re a thirteen-year-old who has just traveled back in time to save the Earth. Somehow, just moments before she was about to stop a lifechanging meteor strik...