Time After Time by Lisa Grunwald

In 1937, Joe feels an instant attraction to Nora when he meets her at Grand Central Station, and Nora feels the same. But then Joe doesn't see Nora again for a year. After having coffee, they take a walk and Nora disappears into thin air. Slowly, Joe learns Nora's story. In 1924, Nora died in a train crash at Grand Central and has since reappeared each anniversary of the day she died. However,the conditions in the station have to be just right, namely the sun has to be shining in a specific spot. How can Nora and Joe sustain a relationship and be together with such constraints? Time After Time recounts their love affair over the years along with fascinating details about the history of Grand Central Station.