Two hundred and eleven years out. Twenty-nine to go. The ship has been lying to you the whole way. Nineteen-year-old Soren Vale fixes air pumps on the generation ship Meridian, where fourteen thousand people believe they are drifting gently toward a new home. Six years after his father died in a "pressure accident", the pipes in his wall still hum at eleven past three every night, and Soren has stopped believing they are only pipes. With a radio operator who hears things she should not, a Captain hiding a failing heart, a gentle old doctor, and a ship that has been keeping secrets for two hundred years, Soren follows the sound to a door that was meant to stay shut until the end of the voyage. Behind it, someone has been counting for a very long time.