A warning from a dying alien leads the Doctor and Bernice to Earth. However Earth in this time period is not a good place to be. The murder rate is rising, but the killers seem to be acting without motive. The TARDIS crew's investigations lead them to a military training planet, a prison inside a star, and a terrifying old foe. And all the time they are being pursued—by two dogged Adjudicators who've stumbled onto a terrifying conspiracy. Chris Cwej and Roz Forrester. Things will never be the same again.