From the first episode we are sucked into this secretive,dark,deadly world of espionage.Characters are believable,likeable and loathsome at the same time,thank god there are people like this on our side to protect us from the horrors of 21st century living. Casting is inspired,Harry is extremely likeable yet ruthless.Tom silent,brooding and deadly,Zoe and Danny human yet loyal to their country.Well done all involved.