Rainy weather and a looming deadline drive Twilight Sparkle up the walls and Spike out of the tree. Only Pinkie Pie can save the day, by introducing the reluctant librarian to an unexpected new hobby. Astoundingly, sex does not ensue.

Wishing to celebrate her sister's return to Equestria, Princess Celestia revives a competition long-forgotten to modern ponydom: a race over the kingdom's oldest road. Twilight Sparkle and her friends sign up to participate in what they think will be a fun diversion, but will their individual reasons for running breed cooperation or conflict?