When twenty-six-year-old Eve McCormick awakes, the images from her nightmare are indelible. The dream feels so real she must force herself to get a grip. This experience is just the beginning for Eve, a Los Angeles clinical hypnotherapist and researcher investigating whether reincarnation is fact or fiction.

Unstoppable visions of an ancient lifetime steal days from her. The danger escalates when she wakes up physically injured and marked with a strange symbol. While Eve battles the past to maintain her sanity and safety, her project is jeopardized as another researcher's attempts to take over. One partner dies and another is accused of inappropriate conduct. Eve and her friend, Dr. Andrea McMurray, don't believe in coincidence and probe their shared visions for answers.

On the other side of the Atlantic, Welshman Ryerson Sanders is haunted by his dreams and believes Eve's research project can help him. For both of them, an ancient Celtic prophecy and long-sought revenge entangles the past with the present. A druidess and a shape-shifter must join to save the druid way of life, while a queen conspires to kill Erin's only high king. Will the oaths and agendas of the past reach across the centuries to strengthen or to destroy?