Back to the Future meets When You Reach Me in this powerful novel by National Book Award nominee Lisa Graff, in which a young girl is able to make sense of the present--and change her future--by meeting her father in the past. As far as twelve-year-old McKinley O'Dair is concerned, the best thing about living in Gap Bend, Pennsylvania, is the Time Hop--the giant party the town throws every June to celebrate a single year...