A modern architect's descent into a dark world reveals two intertwined odysseys: an ancient monk's effort to weave his own fate, and the deadly struggle fifteen centuries later to possess the powerful relic he was charged to protect. Ciaran, a gifted young Irishman, joins an abbey hoping to escape his father's life at sea, yet is subsequently drafted for a historic ocean crossing. Fifteen hundred years later in Chicago, architect Nathan Bang agrees to finish a design for a vanished colleague, and unwittingly enters a shadow world of clandestine projects and sinister clients. While providing cover for a reclusive collector searching for evidence of Saint Brendan's legendary voyage, Nathan makes a discovery that entangles him in an ancient power struggle. Traveling the Saint's path from southwest Ireland across the ocean to the windswept Madeleine Islands of Canada, Nathan not only uncovers Ciaran's sacrifice, but that his own destiny may be unlike anything he could have imagined.