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From the New York Times bestselling author of the Sisters Grimm and NERDS comes the third and final book in the time-jumping, universe-skipping, action-packed m

From the New York Times bestselling author of the Sisters Grimm and NERDS comes the third and final book in the time-jumping, universe-skipping, action-packed m

From the New York Times bestselling author of the Sisters Grimm and NERDS comes the third and final book in the time-jumping, universe-skipping, action-packed m

From the New York Times bestselling author of the Sisters Grimm and NERDS comes the second book in an action-packed middle grade series with equal parts humor a