Chapter 1

Mrs. Murray's face goes white when Mrs. Whatsit talks about the tesseract.

“Wet socks don’t bother me. I just didn’t like the water squishing around in my boots. Now don’t worry about me, lamb.” (Lamb was not a word one would ordinarily think of calling Mrs. Murry.) “I shall just sit down for a moment and pop on my boots and then I’ll be on my way. Speaking of ways, pet, by the way, there is such a thing as a tesseract.”
Mrs. Murry went very white and with one hand reached backward and clutched at a chair for support. Her voice trembled. “What did you say?”