Chief Terry Myell and Lieutenant Commander Jodenny Scott are in that most precarious of military situations, a mixed marriage. Enlisted and officer. It's unnatural. They've been assigned to duty on the planet Fortune, away from the huge ships that carry colonists from the wreckage of polluted Earth to clean new worlds across the galaxy. But there's another way besides spaceships to travel from world to world. A group within Team Space is exploring the Wondjina Spheres, a set of ancient alien artefacts that link places and times. Now those spheres have shut down and Team Space thinks that Terry and Jodenny are part of the key to make them work again-no matter how the two of them feel about it. They can volunteer, or be 'volunteered'. What the researchers can't anticipate is that the status quo, in which Team Space holds the monopoly on travel between worlds, is about to change. And as a result, Terry and Jodenny will be tested to their limits and beyond.