A young female student of anatomy, Lam, on her first day in the dissection room, encounters a cadaver of a young woman which for administrative reasons is taken away. Several months later she is given a head to dissect, and recognises who must have been the head's former owner. Initial interest is purely anthropological, but soon becomes forensic when the possibility of unnatural death is raised. The police do not follow this through, and Lam determines, despite threat of career ruination, she must pursue an investigation herself. Ultimately her efforts are rewarded by the forensic conclusions.