The Municipal Hospital of a small town nestled in the Minas Gerais mountains, was a place of calm routine. Until the disappearances began. A series of inexplicable deaths, each victim succumbing to a devastating infection, baffled the local medical team and police. Dr. Elisa, a sharp-eyed pathologist, and Detective Ricardo, a seasoned but skeptical investigator, found themselves embroiled in a chilling case, where the killer’s weapon wasn't a blade, but a deep understanding of the human immune system. The assassin, a seemingly kind and helpful member of the hospital staff, remained elusive, their true identity hidden in plain sight.