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 strike...