Edinburgh, Summer Solstice: Doctors are being reported missing, and some of their bodies being discovered with their throats cut open. Lothian and Borders Police are in a race against time to make an arrest before the media lay siege to the city. With no apparent motive for the killings, suspicion falls on a group of naturalists. However, Detective Inspector Callum Buchan, who served in the Falklands with the Parachute Regiment, has other ideas...