Doctor Who: The Time Splicer: The Penitentiary (The Time Splicer Series Book 3)

After the Doctors have been captured, Martha and Satsuki have to save them. Yet even if they do, there is still a crisis on Mecrellas, where the threat is rising higher than ever. Unfortunately, nothing can cease the conflict that will rise between the Mecrellans and the planets that the Clockwork Droids have pitted against each other.
Unfortunately, the next adventure has already begun after the last crisis has ended, because the Doctors are now captured and imprisoned on a prison on Jupiter 6: The Eastern State Penitentiary. While Martha and Satsuki are attempting to save them from without, the Doctors have to protect themselves from within.
Here comes the next adventure in the series!