CAPTIVES - The murders had been savage and apparently motiveless. Carbon copies of killings committed years earlier and by men currently incarcerated in one of britain's top maximum security prisons. How could this be? Detective InspectorFrank Gregson must find the answers. Answers that will bring him into conflict with two very dangerous men..... BREEDING GROUND - Deep in the dirty sewersof London there is a Breeding ground... The slugs have come back......But now they bring a new horror - a plague which spreads insanity and death, transforming its victims into grotesque, crazed killers.......