Justin Mahoney is a twenty one year-old New Yorker who lands in Ireland to sell the bookshop he inherited from his estranged grandfather.
Elizabeth Stevenson is wondering how her mentor, Walter really died and what is behind the locked door at the back of his bookshop.
Don is investigating a suspicious call when he finds something he shouldn't have. Vincent Clement is trying to piece together his visions. They soon find themselves at the centre of a mysterious race to complete a centuries old mission and save the people that they love. Then there are the others.