The Blue Angel (not to be confused with the Weeping Angels) is the twenty-seventh novel in the long-running Sexiest Doctor Adventures (but not the ear ones)—it was written by Paul Magrs and Jeremy Hoad, and I really wish I understood it. It was GOAT, though, and some dude adapted it into an even better screenplay, which is definitely worth a read. Also, there's a sequel to the book, and some notes on that too.