The fifth book of the #1 New York Times bestselling I Am Number Four series!

The Garde have suffered an unbearable loss. Number Five has betrayed them. Eight is gone forever. Ella has been kidnapped. The others are now scattered.

In Chicago, John makes the unlikeliest of allies: a Mogadorian named Adam, who has switched sides. Adam knows the Mogs secrets, and he knows where to hit them: their command base near Washington,

...

John, Six, and Seven desperately try to find the rest of the Lorien Nine before it's too late.

With the Mogadorian warships looming over populous cities, the Lorien Garde find new allies, as human teens begin to develop legacies of their own.

In a Spanish convent, seventeen-year-old Marina longs to join forces with her fellow Loriens to prepare for battle with the Mogadorians who destroyed their home planet, while in the United States, John, Six, and Sam elude authorities who think John is a terrorist.