Andy Whitney, his friends, and the US Marines fight for control of Boomerang flying at hyperspeeds through interstellar space, while a recovering post-Boomerang United States of America struggles to fend off invasions from foreign adversaries. In Book Three of the Boomerang Series: Interlude, Andy's quest to return to Earth brings him face-to-face with General Gates who is hellbent on unifying the country, as a powerful new leader emerges in the West.