Ironman runner and trainer Sarah steals a personal time machine from physicist and running partner Paul in order to fix the past mistake that killed her own daughter.

Although I enjoyed the romantic parts of the story and the adult being back in her childhood body, I felt that the walking through of well-trod genre ground didn’t display full understanding of the grandfather paradox: The paradox is presented as being the problem that the time-traveling grandfather-killer cannot return to his own future because he won’t exist. The actual paradox is deeper than that.