Chapter 1: The Signal

Maya Torres almost missed it. She was finishing the last hour of a twelve-hour shift at the Atacama Radio Observatory, monitoring data streams that had produced nothing but cosmic background noise for the past eight months. Her coffee was cold, her eyes were tired, and she was thinking about the scrambled eggs she would make when she got home. Then the spectrograph spiked. Not the random flutter of a pulsar or the broad hiss of solar interference, but a clean, sharp signal repeating at precise intervals. She straightened in her chair and adjusted the receiver. The signal was coming from Proxima Centauri, the nearest star to Earth, just over four light-years away. Its pattern was unmistakable: a sequence of prime numbers transmitted in pulses of focused radio energy. Two pulses, three pulses, five pulses, seven, eleven, thirteen. Then a pause, and the sequence repeated. Maya's hands trembled as she initiated the verification protocol. She re-aimed the array, checked for terrestrial interference, and ran the signal through every filter in her toolkit. The result was the same each time. The signal was real, it was artificial, and it was coming from outside the solar system. She picked up the phone and called her supervisor, Dr. Ramon Gutierrez, who answered on the sixth ring with the groggy irritation of someone woken at four in the morning. 'Ramon, I need you at the observatory. Now.' 'What happened?' 'I found something. I think I found something.' 'You think, or you know?' Maya watched the spectrograph continue its steady rhythm. Prime numbers, the universal language of any civilization that understood mathematics. 'I know,' she said. 'I know and I need a witness before I trust myself.' Ramon arrived in thirty minutes with his shirt buttoned wrong and his hair uncombed. He listened to the signal for ten seconds before sitting down very carefully, as if the chair might not support the weight of what he was hearing.