And everything changes.While Róisín grew up in a tiny village in Ireland, ablaze with a passion for science and the skies and for all there is to discover about the world, François was raised by his beautiful young mother, who dreamt of new worlds but was unable to turn her back on her past.As we loop back through their lives, glimpsing each of them only when a comet is visible in the skies above, we see how their paths cross as they come closer and closer to this moment.Theirs are stories filled with love and hope and heartbreak, that show how strangers can be connected and ghosts can be real, and the world can be as lonely or as beautiful as the comets themselves.

    She still loves her husband, Neal, and Neal still loves her, deeply — but that almost seems beside the point now.Maybe that was always beside the point.Two days before they’re supposed to visit Neal’s family in Omaha for Christmas, Georgie tells Neal that she can’t go. She’s a TV writer, and something’s come up on her show; she has to stay in Los Angeles. She knows that Neal will be upset with her — Neal is always a little upset with Georgie — but she doesn't expect him to pack up the kids and go home without her.When her husband and the kids leave for the airport, Georgie wonders if she’s finally done it. If she’s ruined everything.That night, Georgie discovers a way to communicate with Neal in the past. It’s not time travel, not exactly, but she feels like she’s been given an opportunity to fix her marriage before it starts...Is that what she’s supposed to do?Or would Georgie and Neal be better off if their marriage never happened?