I wanted to put in a good word for this book. The 5-star rating is in context as a Doctor Who book (but if you're not a fan, why would you be buying this?). It's set in the period soon after the Doctor (still amnesiac) is reunited with Fitz and finally gets off Earth (and has just picked up Anji as a new companion.) Those two are my favorite of the DW book companions, so that's a plus. The quality of the writing is excellent, the characters (both the regulars and the "guest cast") well-drawn, and the plot is good. It's "small", in the sense that for once the universe isn't at stake, but the Doctor throws himself into things with his usual intensity. There's a bit of trickiness with the three narrative threads (4 years ago, now, and Anji's life from one point to the other), which could have been irritating but wasn't. "Four years!" you might think, "No way to fit that in without cheating!" And maybe it was a bit of a cheat, but I thought it worked.
The setting is Earth, Mars, and a space station near Jupiter, in the late 22nd century, shortly after the alien (Daleks, though not explicitly named here) occupation of Earth. Human society is just recovering, and even more paranoid than usual, which makes the Doctor's status as an "alien infiltrator" more interesting. The story begins on Mars, where Anji is attacked and left behind to recover while the Doctor's investigation takes him and Fitz (sans TARDIS) across the solar system to the Jupiter space station (under forged credentials). Cue trouble, suspicion, explosions, capture, and all the rest.
Perhaps the best aspect of this book is the portrayal of the relationship between Fitz and the Doctor. Is there even a relationship when the Doctor doesn't remember their shared past? Why does the Doctor never sit down and let Fitz tell him what he does remember? Can the Doctor still be the Doctor or is he bluffing? How did a hundred years alone in exile change him? What changes can you inflict on a person and still have them be themselves? When are they NOT themselves anymore?
"Fitz had decided long ago the Doctor's most annoying habit was turning a pleasant, everyday activity into a life-threatening crisis." And then, "If I die pretending to be an accountant, I'll never forgive myself." Yeah, I love Fitz.