well this was an episode that plays on all persons Irrational fear of the dark at one point or another but the fact that the shadows are “infected” and the line about “the dust in the sun beams” witch i found a bit intimidating but i wont let it get to me now.
the “Expedition” team was a weird thing to have as there was a person there that knew the doctor but the doctor does not know her yet but he is not aloud to look in the book as it is his “Rules” from his future, but the fact that she has his sonic screwdriver could be a bad sign or a good one but as far as thinking who she is i have only a couple of options:
1. just a random person that he as not net yet
2. Captain Jack (it could be possible as he turns in to the Face Of Boe and she has the sonic gun that jack had)
3. a relitive of Rose, Martha or Donna
4. his daughter (after a regeneration or 2/3/4/5 maybe)
the vashta narada are hiding in the shadows and there is something to do with CAL and the girl witch i am having no ease in figuring out but the fact that the logo on the computer terminals in “The Library” and it is on the floor of the room the girl is in so i think there is a connection there but the gohsting on the sutes is one of the worst thing in the whole episode but the next part it is all to become clear and the answeres will be questioned i think in true doctor who fassion.