The Morning of the Day of the Doctor is a great bit of fun. It gives us a peak into Osgoods life and solid bit of time with the Curator, being cryptic and unmistakably themself. This story lives up to the name of being a prelude more than most in this collection as it actually explains the background events of why UNIT were at the gallery and why Osgood had Kates phone. It's not a deep story, but a good bit of fun with our characters.