Everyone thinks the High Lady’s youngest daughter and the quiet Valkyrie are simply best friends. They’ve fought beside each other for thirty years, laughed together, bled together, and never left the other’s side. But Cassara has carried a devastating secret since the day they met: the Cauldron declared them mates. The bond snapped for her—but never for the one person she’s loved through every passing year. As the unacknowledged bond grows harder to bear, fate begins to ask one impossible question: How long can a soulmate keep pretending she’s only a friend?