The artificial marine city of Astrum Close has achieved what no city before it has: a crime rate of 0.001%, maintained by using citizens' dreams to detect and prevent crimes before they occur. Then the city's founder, Professor Albert Rumford, is killed in an incident that should have been theoretically impossible. Special Supervisor Hal is assigned the case. A mysterious ability tied to his left hand lets him perceive past memories. The Clocktower has been silent for twelve years. When its bell finally rings, the final seven days will begin.