How is it possible to know someone you've never met?

Joyce Conway remembers things she shouldn't. She knows about tiny cobbled streets in Paris, which she has never visited. And every night she dreams about an unknown little girl with blonde hair.

Justin Hitchcock is divorced, lonely and restless. He arrives in Dublin to give a lecture on art and is persuaded to donate blood. It's the first thing to come straight from his heart in a long time.

When Joyce leaves hospital after a terrible accident, with her life and her marriage in pieces, she moves back with her elderly father. All the while, a strong sense of deja vu is overwhelming her and she can't figure out why...