My Coworker Is an Imposter

First day at ABC Tech. Badge 023. Deskmate Zheng wears 012 — too far apart by the rule, and he blinks half a beat late. Old Li slips you a note: ten rules. Rule one, never offer water to anyone who never drinks. Ten coworkers. In twenty days you will know which three are not human. Choose what to say, what to swipe, where to look — one wrong line and your badge gets duplicated.