Hah! Take That!
Yesterday I realized that the second half of Chapter 11 was just wrong wrong, wrong. Had to go in today, rip it up, move parts to the next chapter, write about a thousand words to fix the end of Chapter 11, and then write another 1500 words to begin Chapter 12 properly. I am now deep in medieval gynecological and obstetric theory. And the shape of the book is improved. Now, I think, lunch and (because it is pouring out there) the Squeaky Toy for Emily.