The mystery of 'Haunted' continues as Tony Stark, burdened by the ghosts of his past, journeys back to Omaha to get the answers he isn't supposed to be searching for. Despite the warnings of Doc Samson and the opposition of corrupt government officials Norman Osborn and Jack Kooning, Tony has chosen to pursue the unexplainable actions of Gadget, and why it seems there is a connection between her death and those of several other seemingly disconnected people. Meanwhile, the manipulative and power-mad Mandarin is on the verge of unleashing the Extremis pandemic across the world, ready to cause the irreversible outbreak that will grant millions of people uncontrollable powers. All that stands in the way of Mandarin's immeasurable chaos is Tony Stark, now armed in his classic iron suit and ready to battle both his demons and his greatest nemesis! Part 4.