The shapeshifting alien race known as the Skrulls have infiltrated every branch of the Marvel Universe, from S.H.I.E.L.D. to the Avengers, and even the interplanetary defense force S.W.O.R.D. As the New Avengers watch the leader of the Hand, Elektra, transform into a Skrull after her death, they come to realize that an attack is coming, one that has been planned for years. From heroes to villains, anyone could be a Skrull in disguise. Uncertain of who to trust, the team tries desperately to unite against an unseen foe. But it is too late. The invasion has begun. A crashed ship in the Savage Land. A prison break at the Raft. Thunderbolts Mountain under attack. And an armada of Skrull ships approaching Earth. Scattered and hopeless, heroes and villains alike must team up to fight a war they never saw coming, the fallout of which will change the face of the Marvel Universe as we know it. This novel is based on the the bestselling Marvel event by Brian Michael Bendis and Leinil Francis Yu.