Doctor Who: The Blood Cell (12th Doctor novel)

"Release the Doctor – or the killing will start."

An asteroid in the furthest reaches of space – the most secure prison for the most dangerous of criminals. The Governer is responsible for the cruellest murderer so he''s not impressed by the arrival of the man they''re calling the most dangerous criminal in the quadrant. Or, as he prefers to be known, the Doctor.

But when the new prisoner immediatel...