So Vile a Sin is an original novel written by Ben Aaronovitch and Kate Orman and based on the long-running British science fiction television series Doctor Who.

The Great Houses of the Empire manoeuvre and scheme for advantage; alliances are made; and knives flash in the shadows.

Out among the moons of Jupiter, another battle is just beginning, as an ancient brotherhood seeks limitless power and long-overdue revenge.

The novel was originally announced as being written only by Aaronovitch, but due to a hard drive crash on his computer it was delayed and taken on by Orman to complete.

However, in terms of the ongoing narrative of the series it was followed by the five books published immediately previously to it, hence being numbered 56 of 61.