In order to prevent Alys Karstark from having to marry her evil uncle Cregan, Jon arranges for her to marry the Magnar of Thenn (the Thenns being distinct from the Free Folk in that they have lords and fit in with the kneelers south of the wall a bit better). He's also locked up the evil uncle in an ice cell, so there seems to be a bit of redundancy there, though I suppose he'll have to be released at some point.
A raven has been sent to warn Stannis of the Karstarks double-crossing, but it might not reach him.
Melisandre reminds us the the saviour of the universe is supposed to be born amidst smoke and salt and wake dragons. So far that does sound more like Dany than Stannis. She admits having been fallible with regard to Alys not being Arya.
Jon's meddling with the Karstarks is arguable about protecting a maiden, but also could just be meddling. There is something in it for the watch, though: he's hoping Alys will send winter-starved old men and boys to the wall. There might actually be more food at the wall, too, if Jon's import business takes off.
Eleven ships have set sail for Hardhome to rescue wildlings. Hopefully they get there before the slave ships do. Glendon Hewitt has been left in charge of Eastwatch by the Sea and he's friends with Alliser Thorne (most likely person to start a mutiny).
Val returns with Tormund Giantsbane.
