Steven Moffat is a genius. For those who don’t know who he is, he’s the guy who wrote Saturday’s episode of Doctor Who. He also wrote The Empty Child/The Doctor Dances, The Girl in the Fireplace and Blink. Not only that, he’s taking over as Executive Director in 2010! Goodbye Russell T. Davies! I won’t miss you.

If you haven’t seen Saturday’s episode, STOP READING NOW! SPOILERS!

So many questions, so many mysteries. Unlike Blink, it isn’t the suspense that keeps me interested – it’s the feeling of “I have no idea what is going on here”. Let’s locate a few of these mysteries, shall we?

The Doctor and Donna arrive in the biggest library in the universe. It’s deserted, but filled with carnivorous shadows. Why are the shadows there?

The Doctor received a note on his psychic paper from River Song - someone he apparently met in his future – before that person arrives! How does that person know the Doctor’s help is needed? Also, who calls a person River Song?

Strackman Lux – the man who’s family built or own the library. ‘Lux’ means ‘dark’. Coincidence?

Everyone has been saved, but there are no survivors. How is this possible?

The Data Ghosts and the Nodes seem inconspicuous and harmless, but I have my suspicions. Particularly about the Nodes.

What is CAL?

Who is the little girl? How can she see the library through security cameras, her TV, hear the phone ring from the library and fling books around with a remote from her own living room?

Who is Doctor Moon? Notice his name is Moon, which appears at night. It’s dark at night, isn’t it? Coincidence?

Her world is not real, apparently. Then, is she real? Is her dad or Doctor Moon real?

All this in one episode! Staggering. Now, I believe I can answer a couple of the simpler ones.

Saved. This doesn’t just mean rescued. Ever saved data on your computer? That’s what I believe it means – saved to the system. That’s how the Node could access Donna’s face, because her data is on the system.

The little girl. Maybe she is CAL? The human brain is supposedly more powerful than the most powerful super computer. I have one or two theories that go further, but nothing I’m certain about.

And that’s all I can answer. The rest is a mystery to me. Well done Steven Moffat! I honestly cannot wait for next week’s episode!

Unfortunately that is followed by FOUR episodes written by Russell T. Davies. Ugh. After so many good episodes, I guess something has to drag the series down to its usual abysmal standard.