After the full on emotional assault of Left-Handed Hummingbird and Set Piece, Kate Orman settles down a bit here; confining the action to one time and place (well almost) and by and large not torturing the Doctor and his companions (aside from spot of psychic probing). The book is therefore much more laid back and is actually all the better for it. The regular cast are written to perfection and there comes a point where you just like hanging out with them. The one-of characters aren't quite as well defined, but the Doctor's antagonist Colonel White is a great foil for the Doctor (who slowerly drives him insane) and the Dot Smith-Smith a deaf girl who suddenly develops telepathy much to her irritation, are great and its almost a shame they never reappeared.
As with the previous books, Orman's plot rockets along nicely and manages to play with some of the NA cliche's (most of which she created!); paticularly the Doctor running struggle to avoid unnessecary deaths, which signals the character's movement towards the redemption he achieves in the final books in the series.