At eighteen, Su Nian was imprisoned in a basement for three years, and every inch of darkness was carved into her bones. After escaping, she became a criminal psychology expert, using insight bought with scars to solve the most hidden crimes. Criminal Investigation Captain Lu Chen is her only partner, and the only person who knows about her past. When a new series of cases bears an uncanny resemblance to the methods used to imprison her back then, Su Nian realizes she never truly escaped: the real culprit is right beside her. Her forensic pathologist friend Qin Yao is hiding a secret, the gaze of the victim's sister Li Ruoyun keeps wavering, and even her most trusted psychologist, Zhou Ming, seems to be wearing a mask. This time, Su Nian will use her own wounds to find a way out for everyone.
