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Needing medicine to treat a deadly diphtheria epidemic, Julie and Kyle recruit a youth gang, one of whom may be a Visitor spy, to help steal the serum.
Sent to investigate Charles' death, newly arrived Inspector General Philip allows Lydia to choose a trial by combat in a laser duel to the death with Diana.
Anxious to settle a personal vendetta, Philip trails a Fifth Columnist, hoping he will lead him to the Resistance and Donovan.
A year after Liberation Day, courtesy of the red-dust bacteria, the humanoid, lizard-like aliens develop a resistance to the micro-organism and try to regain control of the Earth--only now some humans are knowingly working with them.