In seventeenth-century France, Louis XIV rules with flamboyant ambition, yet the Sun King's appetite for glory knows no bounds. In a bold stroke, he sends his natural philosopher on an expedition to seek the source of immortality, a rare, perhaps mythical, sea monster. When Father Yves de la Croix returns with the shrieking creature with the gargoyle face, Marie-Josßephe de la Croix looks forward to assisting her brother in his scientific experiment. But struck by the creature's gaze and exquisite singing, Marie-Josßephe finds herself contemplating actions that would defy every institution in her life: king, country, church, and even family. Somehow, she must find the courage to follow her heart and her convictions, even at the cost of changing her life forever.