Heiji frowned. "If the first robot was workin' for Zero all along, then why give you the thumb drive in the first place? Why let you get so far in shutting the place down? Seems like a pretty roundabout way of jerkin' your chain. Especially since Zero put up that big act about how put out he was by having to show up himself and fix Calhoun."

He put a hand to his chin, thinking. "The robot must have had a cover story, right? Some reason he wanted to help you guys out? What was it?"