When a strange loss of gravity struck the city, security guard Chen Mo discovered an unexpected link between the mysterious pocket watch left by his grandfather and the 1972 gravity anomaly. His grandfather had not died in an accident: he had led the gravity anchoring experiment that year. As a descendant of the Keepers of Time, Chen Mo is the key to stabilizing the gravitational field. Together with a mysterious curator whose identity is unknown, he ventures deep into an underground experimental facility and activates an energy node, only to become entangled in a century-old feud between the Keepers of Time and the Scavengers. His father's hidden family secrets, the seventeen tokens his grandfather left behind, experimental subjects able to control gravity, and allies and enemies whose loyalties are impossible to discern all drag Chen Mo into a vortex of fate. He must gather the tokens and activate the gravity anchoring array, paying with the memories of his blood kin to fight the mastermind. As the countdown begins and the city drifts toward the sky, he must uncover the experimental conspiracy and family truth that have been buried for half a century.
