Onyx's life revolves entirely around the Clockwork Lands: a world made of five colossal clock gears that power eternal time. As the assistant to her father, the immortal Timekeeper, her days are measured by precise schedules and the rhythmic ticking of her heart gears. However, her days filled with predictability take a swift turn when an unexpected arrival offers her the opportunity to explore beyond her sheltered life for the first time. Stepping foot onto the bronze streets of Pendulum City, Onyx learns of secrets and ideologies she has never heard of, beginning a journey that makes her question the reality she always thought she knew.