Bartholomews Hospital. No one knows that he is dying from leukemia, that he is staring death in the face. He would do anything for a few more months on this earth. In his desperation, he experiments on himself and crosses a line that never should have been crossed. Soon, Barlows body is changing and he is thirsty for human blood. As Barlow stalks the streets of London, DCI John Sinclair has to face his most dangerous enemy yet ...