'48: James Herbert

In 1945, Hitler unleashes the Blood Death on Britain as his final act of vengeance. Hoke, an American pilot and one of a tiny minority with a rare blood group unaffected by the deadly disease, has survived among the debris and dead of London for three years. Now, in '48, a slow-dying group of Fascist Blackshirts believe their only hope is a complete blood transfusion from one of Hoke's kind. They literally want his blood. Running for his life, Hoke is rescued by other survivors and they are pursued through London's ravaged streets and historic landmarks, reaching a dramatic, explosive climax at the top of the Tower Bridge.