Early in the morning, or late last night, Annabelle left her aerie to snuggle with me and Thatch for warmth.  She made a misstep coming down from the heights, and brought a pile  of books with her.  None were heavy or large books but it was a painful  and unwelcome surprise.  So, after I clean the litter, I will get on a step ladder with my dust buster and restack books.