3. In The Silence in the Library, why does River Song think the Tenth Doctor would know who she is?
The Doctor’s first meeting with future wife River Song is her last, yet, initially, she doesn’t know either of those facts. Instead, when the Tenth Doctor professes that he has no idea who she is, she looks utterly heartbroken. But… why? Knowing the Doctor’s different incarnations intimately, she should have surely known that this version would have no idea who she is?
Is there an answer?
Not really, no. It’s entirely possible, of course, that the Doctor’s life is so long that there are future incarnations she is yet to meet, and that’s why she automatically assumed that the Tenth is, like, the Twentieth or something. But, to counter that theory, she does say that she has a book with all his faces in it, and for that future incarnation theory to work, surely we would have to see River Song beyond the Eleventh Doctor? Which, it should be pointed out, we probably won’t. In 2011 DVD minisode collection Night and the Doctor, it is shown that the Eleventh is indeed the Doctor who takes River to the Towers of Darillium, the place he brings her just before Silence in the Library. Her story, sadly, is done.
2. And while we’re on the subject of River Song, how / when does she find out the Doctor’s name?
In Silence in the Library, River Song is able to instantly gain the Tenth Doctor’s trust by whispering his real name into his ear. He’s dumbstruck. He says that there’s only person he would ever tell his name, and only one time he could. But, with Steven Moffat claiming that River Song’s story is done, we never find out what that time is. Why do we never see events that lead to the Doctor telling Song his name?
Is there an answer?
Not an official one, but we might have an idea what the unsatisfying answer is: we’re just not meant to see it. Night and the Doctor, the DVD minisodes mentioned above, centres around the question of: what does the Doctor get up to at night when his companions are asleep? The answer generally seems to consist of lots of naughty dates with River Song – dates which we don’t see on TV. And that basically seems to be it: most of the Doctor and Song’s relationship simply happens off-screen. Including, it seems, whatever incredible adventure lead to the reveal of his greatest secret.