In a parallel universe on present-day Earth, another version of Constance seeks answers to the questions that have haunted her since childhood: How and why did her mother die? The head of a mysterious corporation housed at NASA's Wallops Flight Facility can give her the answers, but not without a price.

Two timestreams collide when the Constance on Earth discovers that Nicolas, her son, has the ability to save the Orb and its inhabitants. Now she must battle treacherous Curators wishing to destroy Nicolas, while on the Orb, another Constance must fight to save the ship from Jupiter's fatal pull.

Only together can they save their son - and future generations of humankind.