Bartholomews 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, Barlows 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 ...