Dark Mirror: Barry MaitlandBrock and Kolla 10. Newly promoted to Detective Inspector, Kathy Kolla of the Serious Crimes Unit is called in by the forensic pathologist regarding the recent sudden death of a London student from what hes determined to be arsenic poisoning. Marion Summers had no reason to be in contact with arsenic and, though once common, arsenic is now very hard to get hold of. The more Kolla investigates, the more she discovers that certain other things about