The seventh and final book in the #1 New York Timesbestselling I Am Number Four series! With United as One, this action-packed series comes to a surprising, breathtaking, and utterly satisfying conclusion. The Garde didn’t start this war, but they’ll do whatever it takes to end it once and for all. . . . The Mogadorians have invaded Earth. Their warships loom over our most populated cities, and no country will risk taking them head on. The Garde are all that stand in the way, but ...