River snuck up to the tree behind Book, as he was speaking, snatching the angel from the top. The two hadn't completely agreed on which object belonged at the top. Being the tallest, Book had placed the angel there, trying to explain why, with telling everybody the tale of christmas.
It wasn't until the crazy girl had hidden the thing that Book even noticed it being missing. She grinned as she handed him the star to replace it. Admitting his defeat, Book placed the star at the very top of the tree.
-- Pretty ... pretty - chapter 24 - "Home For Christmas" by misskitten