When seven coworkers vanish during her first night shift, Lyra Duvell discovers Halcyon Gate isn’t just a research facility — it’s a t between two mirrored timelines. And she’s the impossible glitch holding them together. Hunted by soldiers, haunted by a stranger who fades like static, and betrayed by the scientist who created the Gate, Lyra learns the truth: her alternate-self died ten years ago… yet she somehow survived. With her best friend Rae — a girl who has no alternate version at all — Lyra falls into collapsing worlds, ancient prophecies, and a war between timelines. And when Rae’s existence threatens to destroy reality, Lyra must choose between saving her or saving the world. But some bonds go deeper than destiny. And some echoes refuse to fade.