Four years after her brother, Simon, drowned while in her charge, Francesca, now fifteen, begins to move on after a summer caring for Frankie, who seems to be Simon reincarnated, and getting closer to her best friend's boyfriend.
On the morning of September 11, 2001, sixteen-year-old Kyle Donohue watches the first twin tower come down, then while fleeing home to safety, he finds a girl covered in ash who has no memory.