The TARDIS arrives in the CAGE — not a trap, but the College of Advanced Galactic Education, one of the most prestigious academic institutions in colonised space.
Not a trap. Or is it?
The Doctor's here to receive an honorary degree in Moral Philosophy. But there's something rotten at the heart of the Medical Facility. Someone is operating on the students. Someone without a conscience. Someone with access to a Sidelian Brain Scanner — a technology that hasn't been invented yet.
That someone is the ruthless Time Lord scientist known as the Rani — in her new incarnation. But will the Doctor and Peri recognise the Rani's hand before her trap is sprung?