Sebastian is a detective with a difference - he can see all, hear all, and yet remain unobserved. With his friend, Jackson, he is tracking down a group of ruthless criminals. The Agency is baffled - unexplained violence is breaking out all over the country, normally peaceable people are exploding into rioting, without any cause. It seems a criminal gang is behind this, but how? and why? Agent Sebastian is called in to work on the case and recruits Jackson to help him. Danger is lurking around every corner as they investigate the streets of Soho. Can the two friends succeed where others have failed? This is a detective story for older children to enjoy.