Hotshot Regional Crime Unit inspector Ho is in charge of a serial murder investigation, and knows the only chance he has in cracking the case is to ask for help from his mentor and former boss Bun. Bun was recognized as a gifted criminal profiler until he went mad several years ago and now lives in seclusion with his wife. He has the gift of seeing into a person’s inner personality where subconscious desires and emotions are laid bare. For Bun, they are the key to unlocking a killer’s identity. But for Ho, Bun’s unorthodox approach has put doubt in Ho’s mind.