[Rule-based strange tales, lateral-thinking puzzles, no golden finger, strategy through wits, no couples, not a System novel] To make ends meet, middle-aged Zhang Cuiping enters an abandoned high-rise and signs a bizarre contract forbidding her from quitting voluntarily. She starts work at the “Memory Post Office.” The white envelopes are full of seemingly harmless everyday greetings, while the gray envelopes bring on nightmares of colleagues losing control and vanishing. When the white letters begin whispering directly to her, “You’re next,” Zhang Cuiping must start from scratch and pit herself against memory and menace, finding the only way to survive amid the lies.