Crimson Tides and Moon Shadow is a dark fantasy novel set in the enigmatic and treacherous world of Black Cliff Academy, a boarding school built on ancient secrets and a fragile supernatural truce. The story follows Grace Vance, a seventeen-year-old orphan and scholarship student who arrives at the isolated, storm-lashed school carrying a mysterious past and an even more mysterious locket, the only link to the mother she never knew. Grace quickly discovers that Black Cliff is not a normal school. It is a garrison and a battleground for two hidden societies: the Forest Kin (Lycan), fierce wolf-shifters led by the intense and territorial Kaelan, and the Ocean Court (Sirenia), elegant and manipulative merfolk led by the charming and calculating prince Lysander. Both sides see Grace not as a mere student, but as an anomaly, a "half-breed" whose very existence threatens their centuries-old, precarious ceasefire. As Grace is drawn into their hidden world through mandatory classes like "Lunar Biology" and "Sonic Resonance," she experiences terrifying nightmares and supernatural pulls toward both the forest and the sea. She soon learns the shocking truth: her parents were a Lycan and a Siren whose forbidden love led to their execution. Grace is not just an outsider; she is a living symbol of a union that could shatter the truce, and a powerful catalyst whose blood calls to an ancient, ravenous evil known as the Hungers. Caught between Kaelan's protective, primal loyalty and Lysander's seductive promises of power and belonging, Grace must navigate a deadly game of politics, betrayal, and ancient magic. When a greater conspiracy is unveiled, one that involves the school's own headmaster and a cosmic threat that feeds on fear and discord, Grace realizes she is not just a prize to be won, but the only one who can unite the warring factions against a common enemy. To survive, Grace must embrace both sides of her heritage, forge a Third Power from the union of wolf and siren, and become the Weaver, a living bridge between two worlds destined to either destroy each other or evolve. But the cost of peace is steep, paid in blood, trust, and sacrifice, and the echoes of a far greater threat are already rising from the abyss.