The collapsing empire

Does the biggest threat lie within? In the far future, humanity has left Earth to create a glorious empire. Now this interstellar network of worlds faces disaster - but can three individuals save their people? The empire's outposts are utterly dependent on each other for resources, a safeguard against war, and a way its rulers can exert control. This relies on extra-dimensional pathways between the stars, connecting worlds. But "The Flow" is changing course, which could plunge every colony into fatal isolation.