In Boston, powers are real, heroes are rare, and Jack McGriskin is a private detective with a strong right arm and a nose for trouble. When a missing person he's been hired to find turns up dead, he stumbles into a network of corruption stretching from the streets of Boston to the halls of Congress, and the clues lead him back to a world he'd left behind. And just as things are starting to get back to normal, a new shadow falls across his path in the form of the mysterious Usurper. Collects Jack Hammer #1-4 and Jack Hammer: Usurper #1-2.