In the city of Oakhaven, the Chronos-Key on your wrist is the ultimate judge. It tells you exactly when you will fail, allowing society to forgive and move on once the "mistake" is made. Elias Thorne has spent his life dreading his Zero Hour. When his clock finally strikes 00:00:00, he braces for disaster. But the world stays still. No accident occurs. No bridge collapses. But as Elias investigates his "missing mistake," he realizes that those whose clocks fail are being erased from history by the city’s elite. Now, Elias must commit a real mistake, an act of rebellion, to save the people the clocks have abandoned.