Selected as a Book of the Year 2016 in the Herald and Glamour One Day meets The Time Traveler's Wife in this spellbinding, magical debut novel about love, loss, hope and heartbreak that shows us that for each of us, the world can be as lonely or as beautiful as the comets that illuminate the skies above us. Róisín and François first meet in the snowy white expanse of Antarctica. 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.