When doctoral researcher Elias Chen discovers a perfect signal buried in a dead band of the electromagnetic spectrum, he thinks he has found the anomaly that could define his career. Then a federal agent appears at his door with a warning: the frequency is not from Earth, and the man who first studied it vanished without a trace. Pulled into a covert government task force, Elias learns the truth is far worse than conspiracy. The signal is a bridge. It is probing the boundary between realities, and something on the other side is searching for a way through. As cities begin to distort, electronics whisper in dead languages, and the laws of physics start to slip, Elias becomes humanity's one usable connection to the intelligence behind the transmission. To stop a collapse that could consume multiple worlds, he will have to decide whether the unknown is an invasion, an evolution, or a trap.