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"John Scalzi is the most entertaining, accessible writer working in SF today." -- Joe Hill, author of The FiremanOur universe is ruled by physics. Faster than light travel is impossible -- until the discovery of The Flow, an extradimensional field available at certain points in space-time, which can take us to other planets around other stars.Riding The Flow, humanity spreads to innumerable other worlds. Earth is forgotten. A new empire arises, the Interdependency, based on the doctrine that no one human outpost can survive without the others. It's a hedge against interstellar war -- and, for the empire's rulers, a system of control.The Flow is eternal -- but it's not static. Just as a river changes course, The Flow changes as well. In rare cases, entire worlds have been cut off from the rest of humanity.