'How do you kill someone?' asked the Doctor. 'Eviscerate them, crush them, reverse their particles. But do the dead always stay dead?'
The TARDIS brings the fourth Doctor, Romana and K-9 to the Rock of Judgment: a court, prison and place of execution built into a rocket-powered asteroid. There they become embroiled in an investigation by the system's finest lawman.
What connects the macabre gallery of artist Menlove Stokes with the slaughter of a survey team on a distant planet? Why is Margo, chief of security, behaving so strangely? And which old enemies of the Doctor are aboard the unmarked spaceship making its way towards the Rock?