On the day he loses his job, Lin Xu finds a blue-gray robotic cat in a trash can. It says, "I can give you magical items, but every item comes with rules." A space door: It can only take you to places you've been. If another you appears inside, shut the door immediately. Memory bread: Eating it lets you remember knowledge, but if a face appears on the bread, spit it out at once. Lin Xu thinks it's a cheat code, until he sees another version of himself smiling at him in the mirror. Rules are made to kill. And somehow, he's become the rules' prey.
