Iron Man: Believe

Tony Stark is Iron Man: technological visionary, wealthy playboy, unparalleled engineer and Armoured Avenger. But in one terrifying instant, his greatest invention becomes his greatest mistake. The lethal techno-virus Extremis is out in the wild and out for grabs to the highest bidder. Introducing the Circle, a mysterious high-tech brotherhood of mech-knights, as Tony's hunt for the rogue Extremis units takes him to the island of New Camelot. It's up to Tony to contain Extremis, and that means creating a new suit of armour. Collecting Iron Man Vol. 6 #1-6.