Agent Sebastian is again called in to help solve a difficult case. He is a very different detective. He has a unique skill, he can hear all, see all, and yet remain unobserved. The Controller is baffled. He knows something criminal is going on, but cannot get to the bottom of it. Sebastian is called in as a last resort, as it might prove to be a very dangerous assignment for him.

With his friend Jackson he is soon at work in Mayfair, hunting down a criminal gang, but will he be successful? There is danger around every corner. Can the two friends solve this case?