Lerangis, Peter. Throwback (Series) #3

Thirteen-year-old Corey Fletcher is the world's first Throwback. He has the power to not only to travel back in time, but to change the past. It's a power that comes with no small amount of responsibility- but when Corey tried fix some of history's worst evils, he discovers that the consequences for his good deeds have changed him in ways that he never expected and ways he may not be able to fix. Trapped in a body that's not his own, his powers all but gone, Corey realizes his latest mission may be the hardest of all- to save himself. With the help of his best friend, Leila, and an uneasy alliance with a shadowy group that's been watching his every move, Corey's going to have to risk it all to find a way to fix himself without destroying the world as we know it

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