Last Vow of a Deadly Algorithm

A popular fitness tracking app’s users start dying at the instant its algorithm forecasts their optimal health peak.

FBI Agent Rachel Gift has to determine whether the technology itself has turned deadly.

Each death lands exactly on the predicted moment, turning health data into a countdown.

She is working against forecasts that appear to name death in advance.

Rachel must decide if the app is killing its users or if someone is using that information to hunt them down.