Ison, Graham: - During Graham Ison's thirty-year career in Scotland Yard's Special Branch he was involved in several espionage cases. He also spent four years at 10 Downing Street as Protection Officer to two Prime Ministers. He is an honorary agent of the US Army Criminal Investigation Command. As well as the Brock and Poole Mysteries, Ison is the author of the Hardcastle and Marriott historical mystery series.