California native Glenna Molloy, a travel writer, flies to Ireland to explore sacred places cherished by Finn Maguire, her great lost love, in hopes of finding new meaning in her life. But Coyle Foxworth, her intrusive and cagey co-author, can't work without her. He follows her to County Fermanagh, disturbing her spiritual journey. They visit tiny Caldragh Graveyard with its ancient pagan stone and fairy tree. The graveyard is reputed to be a "Thin Place," where the veil between our world and the Celtic Otherworld is so fragile it can disappear. There they meet a mysterious femme fatale, Maeve, who says she is half-fey. Magical things begin to happen, and suddenly Finn reappears in Glenna's life...