Everything came together to perfection in this episode - the best ever. The chemistry between Sophia Myles and David Tennant was electric and the Murray Gold's music caught its poignancy to perfection. The costumes were sumptuous and there was just enough menace to keep kids behind the sofa now and again, and certainly will stop them looking under their beds at night. And a great one to put before next week's Cybermen as a complete foil to it. It went a long way to explaining a lot of the Doctor's motivation as a character in a variety of other situations. If this episode doesn't win some kind of award, I will eat my sonic screwdriver.