Reek is now Theon again, for a while at least. It is the wedding of Fake Arya aka Jeyne Pool to Ramsay Bolton. Jeyne wants Theon to help her escape but he's too scared to help her. He's there to give the bride away, to make it look more like she's the real Arya. He considers speaking up but is too scared.
The wedding is in the godswood and afterwards Theon hangs around by the weirwood and hears the tree whisper "Theon". That will be Bran, then.
We learn that when Roose Bolton turned up at Winterfell, which had been abandoned, he put the squatters to work mending the roof and then hanged them. Evicting them might have been okay, but this is too much! Theon imagines that he had tried to protect the people of Winterfell. That's not quite how I remember it.
A singer called Abel turns up. He's not all that great at singing. He's definitely a spy! Oh hang on, he's got six women with him. That'll be Mance Rayder and the spearwives, then.
Everyone thinks Manderley is going to betray Roose Bolton any second now. Bolton knows it and won't eat food until Manderley eats it. Lady Dustin has got Roose's number: she thinks he's a psychopath who's just having a bit of fun. That explains why he is less concerned with his legacy than other lords. Then again she thinks he fancies himself the King of the North, once he has dispatched Stannis.
She also voices some suspicions about the Maesters that I've always shared. All this reading of people's mail: you can't tell me they aren't using that ability to influence events. Lady Dustin thinks "the Tully Marriage", presumably between Ned and Catelyn, was the doing of the Maester Walys Flowers.
Everyone is waiting for Stannis to turn up so they can finally defeat him. At the end of the wedding we learn there that Stannis is only two weeks away. Karstark is with him, but will supposedly switch sides in favour of the Boltons.
Ramsay Bolton eschews the traditional "bedding". Instead he makes Theon undress Jeyne Pool. Then he makes Theon help out in the bedroom department more generally. What a weirdo.