Deaf-mute forensic doctor Shen Zhiwei solved a series of murders with her silent eyes, and the cold-faced police officer Lu Xiao became her only language. When each corpse points to the same buried old case, the trembling of psychological consultant Jiang Man, the back of undertaker Chen Yanqiu, and the recording pen of reporter Lin Rui quietly weave a dangerous web. She didn't say it, but all the sins could not escape her eyes.