Verity Grey has never been a woman who recoils from a challenge. But when she is invited to a windy coastal town in Scotland to work on an archaeological dig, she wonders if she has stepped over the line. It's not the ancient Roman history that intimidates Verity--even when that history takes the ghostly form of a slain Roman sentinel--it's her co-worker David Fortune, who frustrates her with his remoteness. As the group of archaeologists strives to uncover the truth of the mysterious Roman campsite, science must contend with the paranormal. The ghost's appearances become more urgent and more chilling until Verity can no longer deny its message--someone is in great danger. Could the deadly warning be for her or for David? Somehow they'll have to communicate with each other, which is proving to be the biggest hurdle they face at the dig site... The wild Scottish landscape is a perfect backdrop for intrigue, as Verity learns that outside the scientists laboratory the shadowy horses of history carry messages from the past.