: The mystery culminates in the revelation of a fourth brother. These siblings were the result of an in-vitro fertilization (IVF) treatment 25 years prior. Their mother, Vivian Brentson, had been told the extra embryos were destroyed, but the clinic—where the victim, Dr. Kiel, had once interned—had instead "donated" them to other families. Forensic Innovation: Antibody Profiling
This response uses data provided by Google's Knowledge Graph [S12E19] Split Decisions
The CSI team uses these unique antibody signatures to differentiate between the brothers, ultimately identifying the specific individual responsible for the murder. Moral and Narrative Implications : The mystery culminates in the revelation of