An alternate-history/alternate-universe CIA novel, where a “sheaf” of the multiverse (the “Real” America) has developed technology to access other, parallell universes with different timelines. Being Americans, they can’t resist spreading their version of freedom, happiness and the American Way to every other universe, whether these universes want it or not.
It’s a fascinating story, well told and suspenseful. It’s slightly marred by explicit exposition and some typographic niggles, and the universe-hopping and toime-travelling becomes a mite confusing near the end, but it’s a very good read.