Transformer

The Morphodite was a genetically constructed genius who had turned the tables on the police state that had created it. Settled down to a man's quiet life, he contemplated a lifetime of doing good in a liberated world... until a vengeance squad wiped out that hope. Now, again utilizing that unique talent, the young woman who was now the Morphodite, realized that the job could not be finished until the enemies of that planet's society were tracked to their interstellar lair and blasted. Across the planet she went and finally into outer space in a city-sized starship to a final showdown somewhere between the worlds. (from the back cover of the DAW Books first edition)