Just published today, this is the latest of the short Who ebooks published by Puffin for the 50th anniversary. It being August, it is the Eighth Doctor's turn, in a brief but effective tale of body horror: a flesh-absorbing alien attacks a small American town, and the Doctor and a hastily acquired Asian-American companion must deal with it. Decently constructed and with sufficient callbacks to The Movie to reassure that this is meant to be part of the same continuity. (No detectable callbacks to the other Eighth Doctor books/comics/audios though.) Scarrow is apparently a rising YA writer, and on this basis I would look for more of his work.