In the beginning they were a group of nine. Nine aliens who left their home planet of Lorien when it fell under attack by the evil Mogadorians, who scattered on Earth and went into hiding, who look like ordinary teenagers, but who have extraordinary skills. The Mogadorians killed Number One, Number Two, and Number Three. They tried to kill Number Four, John Smith, and failed. During the dangerous mission in the catacombs of the Mogadorian caves at the end of 'The Power Of Six', John rescues Number Nine. Now, in order to face the Mogadorians who are relentlessly pursuing them, John and Nine must join forces with Six and Seven who have been fighting the Mogadorians in Spain and who are trying to find Number Eight in India. But how? Only Sam knew the secret location where they were all supposed to meet - and he didn't escape the Mogadorian stronghold. John and Nine must find a way to reunite with Six and Seven and discover the other remaining Loriens to have any hope of winning - or surviving.