Changes

Detective Superintendent Harriet Martens hears a peal of thunder and wonders what it portends. Soon after the telephone rings and she hears that her twin sons, who followed her into the police force, have been caught by a terrorist bomb. One is dead and the other is so badly injured that it's doubtful whether or not he will survive. But within days she's back at work investigating - without any help - the theft of a phial of herbicide, which could be far more devastating than the bomb which took her son, if it fell into the hands of a terrorist. Special Branch put an aging ageing Professor into the frame, but Harriet has her suspicions about W.A.G.I - a group of women campaigning against genetic interference.