On a world doomed to die a pair of wounded survivors discover …. themselves.
For the Doctor, this would be easy, but for the man who stepped out of the TARDIS, still grieving from the Time War, still unsure of himself it might be an impossible task.
For Vastra, the last defender of her people, madness and hopelessness was commonplace. And hopeless madmen falling from the sky just another complication on the road to Armageddon.
For today is the last day of the planet Siluria and tomorrow belongs to the apes…