The Second World War is drawing to a close and mysterious message is being transmitted from Germany, one which will have devastating consequences for three very important men in the Doctor's life: Alan Turing, Graham Greene and Joseph Heller. As time runs out for the 'strangers' will they be able to protect them from the mysterious bounty hunter on their tail...?
Tropes present in The Turing Test include:
- Angelic Aliens: Greene sees the Strangers this way, and the Doctor as well.
- Dirty Coward: Heller believes himself to be one, and is perfectly fine with that.
- Heteronormative Crusader: The very Catholic Greene disapproves of Turing on principle, and in particular hates Turing's infatuation with the Doctor.
- Historical Domain Character: Turing, Greene and Heller.
- Hugh Mann: The two robots hunting down the Strangers, who more or less physically resemble humans, but who are nevertheless deeply uncanny and don't think or act like humans at all.
- Human Aliens: The Doctor is probably the most human-like of all the aliens in the book, but that's not exactly saying much.
- Jerkass: Graham Greene, bordering on a Hate Sink in places. He's an arrogant, racist, homophobic hypocrite...and he has the longest narration out of all of them.
- Laser-Guided Amnesia: The Doctor still has no memory before waking up on a train in 1894.
- Mechanical Lifeforms: Daria and Elgar, the uncannily human robots hunting down the Strangers. The question of whether they count as "people" or just machines is a central theme.
- Meet Cute: Between the Doctor and Turing, when the Doctor climbs a wall to introduce himself to a carved griffon.
- Mood Whiplash: The mostly optimistic end of Turing's narration at the end of Part One, immediately followed by Greene informing the readers that Turning is now dead, and he'll be taking over the story.
- The Greys: The 'strangers'.
- Trauma-Induced Amnesia: The Doctor has no idea who he is, but by now is pretty sure that whatever happened to cause his amesia, it wasn't good.
- Walking the Earth: The Doctor, who's about halfway through his century long exile on Earth, and really beginning to chafe at it.
- World War II
