I think Theon is only mentioned in passing in the book. The book spoiler bit must happen in Feast of Crows?
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Mystery man doesn't seem a nasty piece of work at the moment but time will tell, I suppose! According to my GoT app
I like the Jamie/Brienne bit, too. He's becoming more pleasant if there is such a thing in Game of Thrones. LOL. Ouch, though!
Does anyone watch the Thronecast bit afterwards?