Eric and Helen Brand are pensioners living in an outer eastern suburb of London. One night their only son and his wife are brutally murdered by a gang of youths. Helen chronically ill for over twenty years lapses into a coma at this shocking loss, Eric filled with rage tracks down the killers and meticulously plans to murder them. Later through contacts that aided Eric in his elimination of the killers he is approached by a stranger offering a contract to kill. The path Eric then travels turns this seventy year old pensioner into a ruthless and cold blooded killer.