Call Down the Moon — Mary Gillgannon

In the ninth-century, Irish warrior Connar fell hopelessly in love with Aisling, one of the Nine Sisters, a group of priestesses skilled in healing. When Aisling came to a tragic end, he used magic to travel to the future to reunite with her.

His beloved Aisling is now Allison Hunter, a free-lance writer in Denver. Although Allison doesn't remember her past life, she is instantly attracted to Connar when she interviews him for an article. But someone has followed Connar from the past, and they are determined to keep Allison and Connar apart.

As Allison begins to have visions of a violent and terrifying confrontation, she struggles to separate the past from the present and trust in a love that transcends even death.