A Piece of the Action

Max, Susan and Tinker discover a broken forearm from an ARDU unit and learn that the only way to stop the destruction it is about to unleash is to find a key that exists within the opposite arm…from the 1920’s.
They find themselves caught in the savage gang wars in Chicago, pitted against Al Capone as they fight their way to an ultimate and final battle with the ARDU unit to get the key and return to the future and stop the destruction.