THE RESONANCE STONE WAS ONLY THE BEGINNING. After surviving the shattering of realities at UC Berkeley, Sophia Reyes wants nothing more than one normal morning. But normal ends the moment a familiar blue glow flickers across her dorm room-Aria's collar is pulsing again, and the Signal has returned. Only this time, the fracture between worlds isn't opening. It's collapsing. When a distorted voice appears at Sophia's door and an echo of herself materializes with a desperate warning, she and her friends-Quin, Kay, Martin, Leonardo, Lynn Yvette, and Joshua Allen-are pulled into a second wave of interdimensional chaos. Worlds are slipping out of sync, identities are splitting, and impossible versions of Berkeley are bleeding together. Shadows walk the halls of the Physics Building. Time bends around the Campanile. And something far more predatory than the Wraith has begun hunting them across realities. Armed with only the fractured Resonance Stone, their terrifying knowledge of the echo worlds, and Aria the golden doodle-whose glowing collar may be the key to everything-the group races to stop the collapse before every version of Berkeley merges into one catastrophic reality. But as Sophia and her friends dive deeper into the Echo Lab, uncover hidden versions of themselves, and confront the consequences of the first fracture, one truth becomes impossible to ignore: Not everyone who was split wants to be put back together. Fast-paced, atmospheric, and full of humor, heart, and high-stakes suspense, Topaz Code: The Resonance Stone - Book Two: The Fractured Frequencies blends college-campus mystery with multiverse adventure in a story about identity, courage, and what happens when the lines between worlds-and between who you were and who you could become-threaten to disappear. Perfect for fans of Stranger Things, The Midnight Library, and YA sci-fi with strong emotional stakes, unforgettable characters, and reality-bending twists.