It's been building for months, across a bevy of titles! But now, the moment has arrived for Steve Rogers to step into the light and declare his allegiance to Hydra! How can the heroes of the Marvel Universe cope with this shattering betrayal by the most trusted figure among them? And what will this mean for the world? The map of the Marvel Universe changes in ways nobody will expect—TRUST THE SECRET EMPIRE!

2017's most startling and unexpected comic book event! Captain America, Sentinel of Liberty, has been living a lie! The world's greatest hero is secretly a true believer in the cause of Hydra, brought up since childhood to pursue their mission of progress through authority and unity through adversity! Using the trust and respect he is accorded by the great powers of the Marvel Universe, Steve Rogers has worked his way into a position where he can make Hydra's ideals a reality -and change the landscape of the world dramatically! Now, all the dominos of Steve's plan have been laid out - and it will take only the slightest push to set them into action! Hail Hydra! Collects Secret Empire #0, Secret Empire #1-10, Secret Empire Omega #1, Captain America #25 and material from Free Comic Book Day 2017 (Secret Empire 1).