Haunting — Susan Hart

FBI agent Lili Foxworthy returns to the theatre where her lover, Alaric Wolff, had performed his glorious music. It's there that she meets a man who is eerily similar to Alaric, and also there that she is immediately drawn to him. After Alaric, she felt that this would be impossible, but as a ghostly mystery unfolds, the couple soon become closer than Lili ever dreamed they could be.