A scholar specializing in rare manuscripts, Grace St. John never imagined that a cache of fragile old documents she discovered was the missing link to a lost Celtic treasure. But as soon as she deciphers the intriguing legend, she becomes the target of a ruthless killer. To save herself, Grace must walk back in time -- into 14th-century Scotland -- where she must confront Black Niall. Grace enlists this knight to join her in a modern-day search for a killer. In their quest to protect a timeless secret, they uncover an equally timeless love. But a deadly duel of honor will put everything they have at risk.