The future saves people—then sends back the bodies they would have left behind.

Forty-one days after her daughter's death, signal analyst Dr. Mara Ellison extracts an impossible pattern from an 1891 wax cylinder: an answer that arrives thirteen seconds before its scheduled question is due. The first warning keeps a man's fingertip attached. Then the severed fingertip he never lost appears warm in the lab.

Each completed exchange lets the next answer carry thirteen times more information. Each successful intervention leaves behind the injury or death it prevented—a severed fingertip, burned tissue, teeth, and eventually whole bodies identical to people still alive. As a disaster advances across New Mexico, Mara's calibrated voice becomes the only key to warnings that can save dozens.

But the ninth answer can save sixteen people trapped in rising floodwater. If Mara uses her voice to unlock it, she may make the channel self-perpetuating—turning every later refusal into the same impossible choice: obey, or watch named people die.

To end it, Mara must stay silent while she still has the power to speak.